I'm trying to render a water tank filling with water and am having some problems with flickering. For the water object, I've used a box with an animated boolean to show the tank filling up. On top of the boolean in the modifier stack, the box has a subdivide and then a Houdini Ocean modifier to give the top surface some waves. The animation works great, except for flickering in many places. It almost looks like the front face of the water gets all garbled up and the refraction gets all messed up. However, I'm not sure it's a geometry issue because if I switch the viewport from camera to perspective and move the camera just a tiny little bit, the frame renders fine. I would think that if it was bad geometry at that frame, the refraction would be garbled even if the camera angle was slightly different.
The water material is modified from the water that comes with the Corona Material Library. I made it green and gave it some volumetric scattering to make it look more like rainwater instead of a pristine pool.
It was rendered with Max 2019 with Corona 2 RC4.
Any ideas?
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i9-12900K @ 3.2GHz, 64GB RAM, 3090ti
Max 2024, Corona 10