working render script ?
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parent
c4d9fcf3f7
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14
poetry.lock
generated
14
poetry.lock
generated
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@ -125,6 +125,18 @@ files = [
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{file = "distlib-0.3.6.tar.gz", hash = "sha256:14bad2d9b04d3a36127ac97f30b12a19268f211063d8f8ee4f47108896e11b46"},
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]
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[[package]]
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name = "fake-bpy-module-latest"
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version = "20230118"
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description = "Collection of the fake Blender Python API module for the code completion."
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category = "main"
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optional = false
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python-versions = ">=3.7"
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files = [
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{file = "fake-bpy-module-latest-20230118.tar.gz", hash = "sha256:a3f45879347ef37b6fa5cd66ccc49634a14b420fa1b0fd196dfbf177d8602053"},
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{file = "fake_bpy_module_latest-20230118-py3-none-any.whl", hash = "sha256:66d0b76ba65e01a91f74e77114705d744f3c2ad1078d060abf4a42c7fff9e79b"},
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]
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[[package]]
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name = "filelock"
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version = "3.9.0"
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@ -692,4 +704,4 @@ testing = ["coverage (>=6.2)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7
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[metadata]
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lock-version = "2.0"
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python-versions = ">=3.8.1,<4.0"
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content-hash = "78e5e2403aaceb237ee187dd395971a4ee3a07af884a3d2be70e201a8285b2f4"
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content-hash = "70277d35aa55c1022524e37b75fcd711637ee16fb1737bc157244cf83d57efff"
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@ -10,6 +10,7 @@ numpy = "^1.23.5"
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python = ">=3.8.1,<4.0"
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rich = "^12.6.0"
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opencv-python = "^4.6.0.66"
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fake-bpy-module-latest = "^20230118"
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[tool.poetry.group.dev.dependencies]
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Flake8-pyproject = "^1.1.0"
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@ -1,10 +1,5 @@
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# https://blender.stackexchange.com/questions/38009/3x4-camera-matrix-from-blender-camera
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import bpy
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from mathutils import Matrix
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import pickle
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import numpy as np
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#---------------------------------------------------------------
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# 3x4 P matrix from Blender camera
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@ -117,28 +112,25 @@ def get_3x4_P_matrix_from_blender(cam):
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RT = get_3x4_RT_matrix_from_blender(cam)
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return K@RT, K, RT
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def run_script(scene):
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with open(PICKLE_PATH, 'rb') as file:
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matrices = pickle.load(file)
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# ----------------------------------------------------------
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if __name__ == "__main__":
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# Insert your camera name here
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cam = bpy.data.objects['Camera']
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P, K, RT = get_3x4_P_matrix_from_blender(cam)
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print("K")
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print(K)
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print("RT")
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print(RT)
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print("P")
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print(P)
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projection_matrix, _, _ = get_3x4_P_matrix_from_blender(scene.camera)
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matrices.append(np.array(projection_matrix))
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print("==== 3D Cursor projection ====")
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pc = P @ bpy.context.scene.cursor.location
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pc /= pc[2]
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print("Projected cursor location")
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print(pc)
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with open(PICKLE_PATH, 'wb') as file:
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pickle.dump(matrices, file)
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def setup_script(scene):
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matrices = []
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with open(PICKLE_PATH, 'wb') as file:
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pickle.dump(matrices, file)
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PICKLE_PATH = "/tmp/pickle.truc"
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# clear handlers
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bpy.app.handlers.render_init.clear()
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bpy.app.handlers.frame_change_pre.clear()
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bpy.app.handlers.frame_change_post.clear()
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# add handler
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bpy.app.handlers.render_init.append(setup_script)
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bpy.app.handlers.frame_change_post.append(run_script)
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# Bonus code: save the 3x4 P matrix into a plain text file
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# Don't forget to import numpy for this
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#nP = numpy.matrix(P)
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#numpy.savetxt("/tmp/P3x4.txt", nP) # to select precision, use e.g. fmt='%.2f'
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67
src/blender/render.py
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67
src/blender/render.py
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@ -0,0 +1,67 @@
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import bpy
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import math
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import itertools
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import pathlib
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import pickle
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import sys
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import numpy as np
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# dirty hack to import proj.py
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dir = pathlib.Path(bpy.data.filepath).parent
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dir = dir / "src" / "blender"
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sys.path.append(str(dir))
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from proj import get_3x4_P_matrix_from_blender
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# setup output path
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EXPORT_PATH = pathlib.Path("/tmp/")
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# setup camera poses
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phis = [-45, 0, 45]
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thetas = [0, 45, 90, 135, 180, 225, 270, 315]
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# convert to radians
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phis = [math.radians(phi) for phi in phis]
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thetas = [math.radians(theta) for theta in thetas]
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# create all possible combinations
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poses = list(itertools.product(phis, thetas))
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# create export folders
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pathlib.Path(EXPORT_PATH / "images").mkdir(parents=True, exist_ok=True)
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pathlib.Path(EXPORT_PATH / "masks").mkdir(parents=True, exist_ok=True)
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pathlib.Path(EXPORT_PATH / "cameras").mkdir(parents=True, exist_ok=True)
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# set "File Output" nodes' "Base Path" property
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bpy.data.scenes["Scene"].node_tree.nodes["Image Output"].base_path = str(EXPORT_PATH / "images")
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bpy.data.scenes["Scene"].node_tree.nodes["Mask Output"].base_path = str(EXPORT_PATH / "masks")
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# get camera
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cam = bpy.data.objects["Camera"]
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for i, (phi, theta) in enumerate(poses):
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print(f"Rendering pose {i}...")
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# set camera pose
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bpy.context.scene.objects["Empty"].rotation_euler[0] = phi
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bpy.context.scene.objects["Empty"].rotation_euler[2] = theta
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# get camera matrices
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P, K, RT = get_3x4_P_matrix_from_blender(cam)
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# save camera matrices
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with open(EXPORT_PATH / "cameras" / f"{i:04d}.pickle", "wb") as f:
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pickle.dump({
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"P": np.array(P),
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"K": np.array(K),
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"RT": np.array(RT),
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}, f)
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print(f"Saved camera matrices: {i:04d}.pickle")
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# set frame number
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bpy.context.scene.frame_current = i
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# render the frame
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bpy.ops.render.render(write_still=False)
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