opacity map + secondary ray bias not working

[Art48]

Hi,

I got the following scenario:
A spline; extruded along it a line. This gives me a strip of geometry, flat 2D geometry. On it I map a car wheel drift track, you know, black rubber material.

Now the spline intersects itself multiple times and is 2D in shape, just a 2D line one the X/Y-Plane. I attach a screenshot.

Now It is obvious that some zfighting will occur but I hoped that the secondary ray bias will take care of that and that I don't have to offset the spline in Z. This is also only a layout, later one there will be many, many independant splines, and I don't want to have to accurately offset each one along z as to not get zfighting. Basically something like the "multiply" blend mode would be awesome, or the lighten one for the alpha mask.

How would I go about solving that?

[Art48]

I reduced the artifacts by applying different seeded noises to the geometry, but firstly this is not an ideal solution and secondly there are still artifacts as if the opacity map of the topmost object doesnt simply reveal the opacity map of the one below it but overwrites it instead.

[Vizioen]

This isn't really a solution to your problem but you might be able to use this? https://knowledge.autodesk.com/searc...FF91B-htm.html

[Art48]

Indeed not a solution but a VERY interesting feature nonetheless. We're still on 3ds max 2016 tho. Didn't know about this.

[Art48]

CG support just confirmed the bias is buggy with opacity maps. Devs working on it.