mirror of
https://github.com/alicevision/Meshroom.git
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1e2aaff884
Many minor bug fixes and added the possibility to change the particle color of the rendering to let the user chose the clearest color in their case. Commented a lot of my code to make it readable to someone else that myself.
312 lines
No EOL
15 KiB
Python
312 lines
No EOL
15 KiB
Python
import bpy
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import bmesh
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import os
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import re
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import mathutils
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import math
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import sys # to get command line args
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import argparse # to parse options for us and print a nice help message
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from math import radians
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def main():
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argv = sys.argv
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if "--" not in argv:
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argv = [] # as if no args are passed
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else:
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argv = argv[argv.index("--") + 1:] # get all args after "--"
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# When --help or no args are given, print this help
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usage_text = (
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"Run blender in background mode with this script:"
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" blender --background --python " + __file__ + " -- [options]"
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)
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parser = argparse.ArgumentParser(description=usage_text)
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parser.add_argument(
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"--sfMData", dest="SFM_Data", metavar='FILE', required=True,
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help="These info carry the cloud point we need.",
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)
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parser.add_argument(
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"--sfMCameraPath", dest="SFM_cam_path", metavar='FILE', required=True,
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help="This text will be used to render an image",
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)
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parser.add_argument(
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"--cloudPointDensity", dest="Cloud_Point_Density", type=float, required=True,
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help="Number of point from the cloud rendered",
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)
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parser.add_argument(
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"--particleSize", dest="Particle_Size", type=float, required=True,
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help="Scale of every particle used to show the cloud of point",
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)
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parser.add_argument(
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"--undistortedImages", dest="undisto_images", metavar='FILE', required=True,
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help="Save the generated file to the specified path",
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)
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parser.add_argument(
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"--outputPath", dest="output_path", metavar='FILE', required=True,
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help="Render an image to the specified path",
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)
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parser.add_argument(
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"--particleColor", dest="Particle_Color", metavar=str, required=True,
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help="Color of every particle used to show the cloud of point",
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)
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args = parser.parse_args(argv)
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if not argv:
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parser.print_help()
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return
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if not args.SFM_cam_path:
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print("Error: --SFM_cam_path argument not given, aborting.")
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parser.print_help()
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return
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if not args.undisto_images:
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print("Error: --undisto_images argument not given, aborting.")
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parser.print_help()
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return
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if not args.Cloud_Point_Density:
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print("Error: --Cloud_Point_Density argument not given, aborting.")
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parser.print_help()
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return
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if not args.Particle_Size:
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print("Error: --Particle_Size argument not given, aborting.")
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parser.print_help()
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return
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if not args.output_path:
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print("Error: --output_path argument not given, aborting.")
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parser.print_help()
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return
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if not args.Particle_Color:
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print("Error: --Particle_Color argument not given, aborting.")
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parser.print_help()
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return
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#Clear Current Scene
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try:
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for objects in bpy.data.objects:
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bpy.data.objects.remove(objects)
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except:
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print("Error: While clearing current scene")
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# import Undistorted Images
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undis_imgs = []
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#Some of these info will be very useful in the next steps keep them in mind
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number_of_frame = 0
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offset = 0
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first_image_name = ""
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try:
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# In this part of the code we take the undistorted images and we process some info about them
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# undis_imgs is the list of the images' names
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# first_image_name says it all in the name
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# The offset is important, it corresponds to the last part of the name of the first frame
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# In most case it will hopefully be 0 but the sequence may start from another frame
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files = os.listdir(args.undisto_images)
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for f in files :
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if f.endswith(".exr") and not f.__contains__("UVMap"):
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undis_imgs.append({"name":f})
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number_of_frame = len(undis_imgs)
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first_image_name = undis_imgs[0]['name']
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offset = int(re.findall(r'\d+', first_image_name)[-1]) - 1
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except:
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print("Error: while importing the undistorted images.")
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#import abc (Animated Camera)
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try:
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# In this part of the code we import the alembic in the cam_path to get the animated camera
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# We use cam_location and cam_obj to store information about this camera
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# We look for a camera (of type 'Persp') with the name 'anim' (not to confuse them with previously imported cams)
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# Such hard code is not a problem in this case because all imported cams come from previous nodes and are named specificaly
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# Once the cam has been found we select is make it the main camera of the scene
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# The rest of the code is setting up the display of the background image,
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# Since it's not a simple image but an image Sequence, we have to use the offset and the number of frame
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# Information taken from the previous block of code.
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# The frame method is the one that align with the Cloud of Point althought this may change
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# so feel free to try out the two other settings if something changes on previous nodes.
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# We also have to make the scene render film transparent because we want to be able to display
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# our background afterward in the next block of code
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bpy.ops.wm.alembic_import(filepath=args.SFM_cam_path)
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animated_cams = bpy.context.selected_editable_objects[:]
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cam_location = mathutils.Vector((0, 0, 0))
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cam_obj = None
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for obj in animated_cams:
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if obj.data and obj.data.type == 'PERSP' and "anim" in obj.data.name:
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bpy.context.scene.collection.objects.link(obj)
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bpy.context.view_layer.objects.active = obj
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bpy.context.scene.camera = obj
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cam_location = obj.location
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cam_obj = obj
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bpy.ops.image.open(filepath=args.undisto_images + "/" + first_image_name, directory=args.undisto_images, files=undis_imgs, relative_path=True, show_multiview=False)
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bpy.data.cameras[obj.data.name].background_images.new()
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bpy.data.cameras[obj.data.name].show_background_images = True
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bpy.data.cameras[obj.data.name].background_images[0].image = bpy.data.images[first_image_name]
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bpy.data.cameras[obj.data.name].background_images[0].frame_method = 'CROP'
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bpy.data.cameras[obj.data.name].background_images[0].image_user.frame_offset = offset
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bpy.data.cameras[obj.data.name].background_images[0].image_user.frame_duration = number_of_frame
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bpy.data.cameras[obj.data.name].background_images[0].image_user.frame_start = 1
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bpy.context.scene.render.film_transparent = True
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except:
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print("Error: while importing the alembic file (Animated Camera).")
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#Place the particle plane
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try:
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# This is a key step if you are displaying a cloud point.
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# We are using a particle system later in the code to display the cloud point.
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# To make it so, we need a model for the particle, a object that will be repeated a lot to make a shape.
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# In order to do that we need a plane (one face only for optimisation purpose) that always face the camera.
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# So we made a plane and made it a child (in the parenting system) of the camera. That way whenever the cam
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# moves, the plane moves and turn accordingly.
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# Bmesh creates the plane and put it into the mesh. We change the size of the plane according to
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# the scale given in arguments. We need to adjust the plane's location because putting it at the
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# exact location of the camera blocks the view. Then, the switcher give a RGBA color according to
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# the given argument... This is where it gets harder. We have to use a material that uses 'Emission'
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# otherwise the particle is going to react to lights and we don't really need that (the color wouldn't be clear).
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# To do that we have to use the shader 'node_tree' we clear all links between nodes, create the emission node
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# and connects it to the 'Material Output' node (which is what we will see in render).
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# Finally we use the switcher to color the model.
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plane = bpy.data.meshes.new('Plane')
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objectsPlane = bpy.data.objects.new(name="Plane", object_data=plane)
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bm = bmesh.new()
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bmesh.ops.create_grid(bm, x_segments = 1, y_segments = 1, size = 1.0)
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bm.to_mesh(plane)
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bm.free()
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objectsPlane.scale = mathutils.Vector((args.Particle_Size, args.Particle_Size, args.Particle_Size))
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cam_location.y += -2.0
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objectsPlane.location = cam_location
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bpy.context.scene.collection.objects.link(objectsPlane)
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bpy.data.objects['Plane'].parent = cam_obj
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bpy.context.view_layer.objects.active = objectsPlane
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switcher={
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'Grey':(0.2, 0.2, 0.2, 1),
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'White':(1, 1, 1, 1),
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'Red':(0.5, 0, 0, 1),
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'Green':(0, 0.5, 0, 1),
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'Magenta':(1.0, 0, 0.75, 1)
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}
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col = bpy.data.materials.new('Color')
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objectsPlane.active_material = col
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objectsPlane.active_material.use_nodes = True
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objectsPlane.active_material.node_tree.links.clear()
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objectsPlane.active_material.node_tree.nodes.new(type='ShaderNodeEmission')
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objectsPlane.active_material.node_tree.links.new(objectsPlane.active_material.node_tree.nodes['Emission'].outputs['Emission'], objectsPlane.active_material.node_tree.nodes['Material Output'].inputs['Surface'])
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objectsPlane.active_material.node_tree.nodes['Emission'].inputs[0].default_value = switcher.get(args.Particle_Color, 'Invalid Color')
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except:
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print("Error: while setting up the particle model.")
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if (args.SFM_Data.endswith('.abc')):
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# This part is all about importing the Cloud Point and setting up the Particle System to make a good render
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# After importing the alembic we look for a specific meshe in the file. Again the hard coded name would be a
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# problem if the previous nodes hadn't name it specificaly that (.001 because a meshe with the same name has
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# been imported with the animated camera).
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# Once the cloud point has been found. We make it the active object (important for the node_tree later).
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# Then, we create a particle system on it. Render_type set to object and the said object is the plane,
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# thanks to that the particle format is set to repeat the plane. Emit_from 'vert' so the points of the
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# cloud of point are the one rendering the particle.
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# The count is the number of particle repeated on the cloud of point. We use the rate given as arguments
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# to give a number. Most of the following settings are just formalities except use_rotation and use_rotation_instance
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# those two make sure to use the same roation as the model which is vital to have the particle always facing the camera.
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#import abc (Cloud Point)
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try:
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bpy.ops.wm.alembic_import(filepath=args.SFM_Data)
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all_abc_info = bpy.context.selected_editable_objects[:]
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for obj in all_abc_info:
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if obj.name == 'mvgPointCloud.001': #May have a problem with such hard code
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bpy.context.scene.collection.objects.link(obj)
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bpy.context.view_layer.objects.active = obj
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obj.modifiers.new("ParticleSystem", "PARTICLE_SYSTEM")
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particle_system = bpy.data.particles["ParticleSystem"]
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particle_system.render_type = 'OBJECT'
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particle_system.instance_object = bpy.data.objects["Plane"]
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particle_system.emit_from = 'VERT'
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particle_system.count = int(args.Cloud_Point_Density * len(obj.data.vertices.values()))
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particle_system.frame_end = 1.0
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particle_system.use_emit_random = False
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particle_system.particle_size = 0.02
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particle_system.physics_type = 'NO'
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particle_system.use_rotations = True
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particle_system.use_rotation_instance = True
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particle_system.rotation_mode = 'GLOB_X'
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except:
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print("Error: while importing the alembic file (Cloud Point).")
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#Or import obj directly
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elif (args.SFM_Data.endswith('.obj')):
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bpy.ops.import_scene.obj(filepath=args.SFM_Data)
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else:
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print("SFM_Data isn't in the right format, alembics(.abc) and object(.obj) only are supported")
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#WE HAVE TO USE THE GRAPH TO MAKE THE BACKGROUND IMAGE VISIBLE
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try:
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bpy.context.scene.use_nodes = True
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#CREATE ALL NODES WE NEED (Color.AlphaOver, Input.Image, Distort.Scale)
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bpy.context.scene.node_tree.nodes.new(type="CompositorNodeAlphaOver")
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bpy.context.scene.node_tree.nodes.new(type="CompositorNodeScale")
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bpy.context.scene.node_tree.nodes.new(type="CompositorNodeImage")
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#SET THEM UP CORRECTLY
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bpy.data.scenes["Scene"].node_tree.nodes["Image"].frame_duration = number_of_frame
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bpy.data.scenes["Scene"].node_tree.nodes["Image"].frame_offset = offset
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bpy.data.scenes["Scene"].node_tree.nodes["Scale"].space = 'RENDER_SIZE'
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bpy.data.scenes["Scene"].node_tree.nodes["Scale"].frame_method = 'CROP'
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bpy.context.scene.node_tree.nodes["Image"].image = bpy.data.images[first_image_name]
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#LINKS THE NODES THAT NEEDS TO BE LINKED
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bpy.context.scene.node_tree.links.new(bpy.context.scene.node_tree.nodes['Alpha Over'].outputs['Image'], bpy.context.scene.node_tree.nodes['Composite'].inputs['Image'])
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#Two Inputs of AlphaOver are named "Image" so we'll use index instead
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bpy.context.scene.node_tree.links.new(bpy.context.scene.node_tree.nodes['Render Layers'].outputs['Image'], bpy.context.scene.node_tree.nodes['Alpha Over'].inputs[2])
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bpy.context.scene.node_tree.links.new(bpy.context.scene.node_tree.nodes['Scale'].outputs['Image'], bpy.context.scene.node_tree.nodes['Alpha Over'].inputs[1])
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bpy.context.scene.node_tree.links.new(bpy.context.scene.node_tree.nodes['Image'].outputs['Image'], bpy.context.scene.node_tree.nodes['Scale'].inputs['Image'])
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except:
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print("Error: while composing the compositing graph.")
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## Starts the rendering and launchs it with a blender animator player
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try:
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# Setup the render format and filepath
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bpy.context.scene.render.image_settings.file_format = 'FFMPEG'
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bpy.context.scene.render.filepath = args.output_path + '/render.mkv'
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# Render everything on to the filepath
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bpy.ops.render.render(animation=True)
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# Starts a player automatically to play the output
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bpy.ops.render.play_rendered_anim()
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except:
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print("Error: while rendering the scene.")
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if __name__ == "__main__":
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main() |