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[Import fSpy JSON to Nuke] load a json file with camera data from fSpy into Nuke for single frame camera alignment https://fspy.io/ #fspy #nuke
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| import json | |
| import nuke | |
| def Matrix4toList(M): | |
| mVals = [] | |
| for i in range(len(M)): | |
| mVals.append(M[i]) | |
| return mVals | |
| # --- load file --- | |
| fp = nuke.getFilename("Select fSpy data file", "*.json") | |
| with open(fp) as datafile: | |
| data = json.load(datafile) | |
| # --- create camera, set knobs | |
| camera = nuke.createNode("Camera") | |
| # camera transform | |
| M = nuke.math.Matrix4() # camera pose | |
| matrixVals = data["cameraTransform"]["rows"] | |
| for row, values in enumerate(matrixVals): | |
| rowStart = row * 4 | |
| M[rowStart + 0] = values[0] | |
| M[rowStart + 1] = values[1] | |
| M[rowStart + 2] = values[2] | |
| M[rowStart + 3] = values[3] | |
| camera["useMatrix"].setValue(True) | |
| camera["matrix"].setValue(Matrix4toList(M)) | |
| # projection parameters | |
| aspectRatio = float(data["imageWidth"]) / float(data["imageHeight"]) | |
| camera["vaperture"].setExpression("haperture / {aspect}".format(aspect=aspectRatio)) | |
| camera["focal"].setExpression("haperture / (2 * tan({hFOV} / 2))".format(hFOV=data["horizontalFieldOfView"])) | |
| principal = data["principalPoint"] | |
| camera["win_translate"].setValue([principal["x"], principal["y"]]) |
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