Black spots in reflection

[jsr]

Anyone have any idea how to get rid of the black spots in the left side reflection? The spots seem to be in the top parts of surface bumps.

I use reflection interpolation to speed up rendering. Increasing subdivs doesn't have effect. Increasing antialiasing, no effect. Max depth, no effect. Icreasing max rate has some effect but makes rendering too slow.





Link to max file

[Raven]

Try setting your exit colour in your reflection to what ever colour you want the those spots to be.

[jsr]

Exit color has no effect either.

This is a rendering without reflection interpolation with 20 subdivs, less antialiasing and bright red exit color. Black areas are now more visible. I don't understand where they come from.

Could it be because I'm not using refractions? I tried to add refraction too but black areas didn't disappear.

If anyone wants to test the scene the max file is here

[jsr]

Here the reflection material is like a clean mirror (fresnel=off, non glossy (1.0) with max depth=100, cutoff 0,001 and exit color rgb=255,0,255).


Here the max depth is reduced to 1 and you can see the cutoff color. But there are still black spots.


Here the same scene rendered with max scanline with max raytrace material. There are no black spots.

[roppin]

I tryed it and I think it´s got something to do whith the noisemodifier. Try use vray displacementmap insted.

[roppin]

or increase the density of the plane at rendertime to something like 4. and decrease noiceiterations to 4 an allso upscale the map as it is quite small.

[jsr]

But how come max raytrace don't produce the spots?

Actually I would like to use the Dreamscape sea surface which is about as dense as this sample file. What do you think about making large sea surfaces with VRay displacement? Is it adaptive so that close details get more faces than far away details?

[roppin]

no idea!