I'm testing out Modo at the moment and running across a visual bug that seems to occur on export. If I put a brush effect on a stroke, it appears to get clipped once the animation is exported.
To demonstrate, I've drawn a basic triangle on a vector layer in a new file. I've then applied a watercolour brush effect to the stroke of that shape:
If the layer is selected, playback within Modo is fine - I've got line boil and various other settings on to give it a bit of randomness. However, once exported, the effect is clipped by some kind of invisible mask:
If I scrub through the render, you can see that the invisible mask stays in the same place:
Nothing I do seems to have any effect on this clipping. Shrinking the size of the stroke also seems to reduce the size of the invisible mask along with it, so clipping still occurs (It's less noticeable at a smaller scale, but it's definitely still there). The invisible mask also doesn't seem to correspond at all to the frame that shows when you select the object in Modo (that particular frame is actually a lot small than the invisible frame). Some brushes are more affected by it than others - here's a different brushes with a less noticeable clip:
I'm not entirely sure how the brushes work, but given they seem to be a static image that's duplicated, scaled, rotated, etc along the stroke path, is there a chance that the frame these individual brush images are sitting are not rotating along with the brush itself? So rather than the brush image and its individual frame being rotated as one object, the brush image is being rotated inside a square frame while the frame itself stays the same?
