Displacement/Normal/Bump shadows

[DanSHP]

See image.

Vray Sun. VrayDisplacement asphalt material using maps from textures.com. https://www.textures.com/download/3d...151?q=asphalt7

The areas highlighted seem wrong to me. This strange effect is exacerbated switching to normal or bump or a combination of all height maps. So I'm a little lost.

At first I thought it was the displacement amount in the modifier but it's set to 4mm (nothing crazy). I can't understand how such low values can produce such strong and choppy shadows.

Any ideas?

[DanSHP]

Another here different material/textures.

I get that shadows blur towards their edges but this seems too choppy.

[DanSHP]

Corona



No such issues. In fact I've cranked the displacement up to 20mm and it looks correct. Also, I've noticed my 3d text casts shadow in Corona (also bg plane), yet in vray it does not? Shadow bias issue?

[DanSHP]

OK.

So turns out, it was Shadow Bias in vray sun. I have my units set to meters, so the default bias is 0.2m but setting it to 0.0 resolves the issue. I'm assuming there is some scale conversion issue? Gah...

Can anyone from Chaos group clear this up?

[DanSHP]

https://forums.chaosgroup.com/forum/...un-shadow-bias

[hermit.crab]

Thanks for the report. We are aware of the issue (Internal bug-tracker id: VMAX-1640). I'll bump its priority additionally.