Decals in 3dsMax

Corona Corona for 3ds Max Help Required
1

Hey,
I have a ton of Posters/Cracks/Dirt applied as “decals”, meaning a texture on a plane with an alpha channel, alligned to a surface, mostly walls.
I allign those to the wall an push it a min distance from the wall, so there is no Z-fighting and deactivate shadows to remove flickering shadows/artifacts.
Problem being, that it makes the UHD cache flicker at times, as it picks up these microscopic distances.
(I cant push it further, as it creates parallax, I cant disable for those, as these are big with heavy color bleed needed from those)

Is there a correct way to do decals with corona?
I can’t remap everything to composite maps, as this is imported geometry with thousounds of planes containing textures of such type.
Anyone any insights?

2

Do you need UHD Cache here? Is it an interior so PT+PT is not an option?

Are you using the “animation flicker free” preset of UHD Cache?

3

PT+PT is awefully slow for a 1000+ frame animation.
Yes, flicker free is used.

This is a “bug” I reported ages ago. It didnt hit me, until ondra took a look at the scene. (GI baking, UHDC restrictions and Animation - Corona for 3ds Max :: Requests - Chaos Forum)
It’s a problem with distances, that are sometimes below and sometimes above sampling thresholds. So its a scene setup problem.

The question is, wether it is possible to apply a texture to a wall without geometry with depth I suppose, without resorting to remapping/baking composite maps.

4

Could you submit a ticket about it and include a sample scene? (it can be small, just with the problem visible)
https://coronarenderer.freshdesk.com/support/tickets/new

Saving and re-using UHD Cache for all frames is also not an option?