Created
June 8, 2021 07:49
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a function to create an animated ramp to color a curve for arnold in maya
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| import pymel.core as pm | |
| import random | |
| def ramp_to_curve(curve, anim_length=20, color1=(0.01, 0.01, 0.01), color2=(1, 1, 1)): | |
| ramp = pm.shadingNode('ramp', asTexture=True) | |
| place2d = pm.shadingNode('place2dTexture', asUtility=True) | |
| place2d.outUV >> ramp.uvCoord | |
| place2d.outUvFilterSize >> ramp.uvFilterSize | |
| ramp.cel[2].ep.set(1) | |
| ramp.cel[0].color.set(color1) | |
| ramp.cel[1].color.set(color2) | |
| ramp.cel[2].color.set(color1) | |
| anim_curve = pm.createNode('animCurveTU') | |
| anim_curve.addKeys((1, anim_length), (0, 1)) | |
| anim_curve.setPostInfinityType('cycle') | |
| anim_curve.output >> ramp.cel[0].ep | |
| add1 = pm.createNode('addDoubleLinear') | |
| anim_curve.output >> add1.input1 | |
| add1.input2.set(0.05) | |
| add1.output >> ramp.cel[1].ep | |
| add2 = pm.createNode('addDoubleLinear') | |
| anim_curve.output >> add2.input1 | |
| add2.input2.set(0.1) | |
| add2.output >> ramp.cel[2].ep | |
| ramp.outColor >> curve.aiCurveShader | |
| curve.aiMode.set(1) | |
| curve.aiCurveWidth.set(0.01) | |
| curve.aiRenderCurve.set(1) | |
| pts=[] | |
| for i in range(10): | |
| pts.append([0, i, 0]) | |
| curve = pm.curve(editPoint=pts) | |
| ramp_to_curve(curve=curve, | |
| anim_length=15 + random.randrange(8), | |
| color2=(random.uniform(0.5, 1), random.uniform(0.2, 1), 1)) | |
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