OTOY Forums

Ok, so im comping a snake into a shot. Using a simple ground plane as a Matte shadow catcher.
The snake will penetrate the ground plane. But instead of the shadow just being black, its creating a clear edge along the perimeter of where the geometry intersects. Also renders as a hole within the alpha.

Any ideas? fix or remedy?

Hi,

Sorry, but I'm not sure how to reproduce this problem here. Can you please send me an scene, as simple as possible, to try to reproduce it? I wonder if the problem could be related to the kernel node ray epsilon parameter ...

Thanks,
-Juanjo

Yup.. it is Ray Epsilon. Changing its value changes the size of the hole (line) BUT.. the inner hole remains with partial shadow when it should be 100% shadow.
And im not certain if the changes to alleviate the line will create problems with the rest of the render.

so its definitely a glitch , unless another function value will remedy the hole.

Now.. i understand that this shouldn't be much of an issue considering it a shadow being covered up by the object. But when compositing if your to manipulate the shadow its possible that the object will
be in a position that the presence of the hole will create issues.

Could also be caused from the octane displacement. I think i've ran into this before and had to render each pass separately.