Learn how to render Motion Vector AOVs ( render pass ) in Houdini using a simple technique...

float speed = length(@v); ( length of velocity )
speed = fit(speed, ch("min_speed"), ch("max_speed"), 0, 1);
( remap values using fit function )
@Cd = chramp("speed_color", speed); ( assign color to fit value )

for pyro, There is a slightly different process check this image Click Here


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