Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: Deckard on 2021-08-17, 11:45:32

Title: [solved] Motion blur and animated textures
Post by: Deckard on 2021-08-17, 11:45:32

Hi,
I have a scene using an animated texture as displacement map and I noticed that motion blur doesn't work with this map. I suppose it's a bug? Any way it could be fixed?
Thank you.

Title: Re: Motion blur and animated textures
Post by: TomG on 2021-08-17, 13:08:38

Sounds more like a known limitation than a bug, which is that if the number of faces change, motion blur is not possible. It can only work where the faces remain the same but move around - displacement being animated likely generates completely different faces, and there's no way for the render engine (currently) to know "this pixel from this face has moved from here to here" since the faces are completely rebuilt. Devs or support could say more, most likely :)

Title: Re: Motion blur and animated textures
Post by: Deckard on 2021-08-18, 10:09:14

I see what you mean, thanks for your response.

Title: Re: Motion blur and animated textures
Post by: maru on 2021-08-18, 11:53:51

This might not be possible (depending on the case) but if you subdivide the mesh a lot (for example using the Turbosmooth modifier) and apply the Displace modifier to it, this should work. This is because the number of faces will not be changing, only vertex positions.

Title: Re: Motion blur and animated textures
Post by: romullus on 2021-08-18, 15:49:20

What about setting displacement to world size? I think this should work, at least in theory, since it's not changing subdivision between the frames.

Title: Re: Motion blur and animated textures
Post by: maru on 2021-08-18, 17:52:38

Quote from: romullus on 2021-08-18, 15:49:20

What about setting displacement to world size? I think this should work, at least in theory, since it's not changing subdivision between the frames.

Yes, that might work as well!