OTOY Forums

open the attached project
Note that the "blade instance" object has a scale of -1 in the X axis to flip the model
render to picture viewer
The spinning blade will blur correctly

Set the "blade instance" scale from -1 to 1 to reset the model back to its real shape
render to picture viewer
bug: there is no motion blur

There is a second odd / related behaviour. If you drag the "blades" object from being a child of "group 1" and move it to "group 2", then the motion blur will work again.

My guess is that octane is looking at the "group 2 object" being instanced, sees the only thing inside is a null, and doesnt then check the children to see if there is any moving geometry it should consider. The fact that a -1 scale on the model fixes it though I cannot explain.

octane 2023.1.2 r5
c4d 2024.2.0
win 11
gf 3090

Try this. Octane tag should be on the animated geometry. Post looks like done with wrong impression.

Your screenshot shows the geometry is still inverted with a -1 scale. Change the scale of "blade instance" from -1, 1, 1. to 1, 1, 1 and you will see the motion blur breaks. The -1 scale is magically fixing the motion blur... somehow.

File attached with the octane tag on the instance as you suggest, but still broken.