SDK: Normals and BumpNormals

V-Ray V-Ray Common Public
1

Hi,

how do I set my BumpNormals, so they are outputted in the BumpNormals-RenderElement?

Or do I just write them manually in the traceForward()-method?

Aya~

2

Yep. This is what VRayMtl does also. V-Ray itself is not aware of what normals you will be using in your material.

Best regards,
Vlado

3

Okay, but then I have an other problem.. :slight_smile:

I wrote the material using Vray Sp2 for Max 2009.. I transformed my normals like this:

VR::BSDFSampler* VRayScanlineMtlBase::newBSDF(const VR::VRayContext &rc, VR::VRenderMtlFlags flags) {

		Point3 bumpValue = bumpMap->EvalNormalPerturb(sc);
		bumpValue *= ((float)bumpStrength * 0.005f);
		sc.SetNormal(FNormalize(sc.Normal() + (sc.backFace ? -bumpValue : bumpValue)));

//[... other BSDF Init Stuff]
}

and it works all fine.

But in Sp3 now, when I connect an VRayDirt to my Diffuse-Color-Channel, the dirt is ignoring my normal-transformations… in Sp2 it’s working, in Sp3 not… why? What’s the difference?

(With a normal Max-StdMaterial it’s working in both.. Sp2 and Sp3)

Aya~

4

I’m not quite sure, but you have the sources of VRayDirt in the SDK, so you can debug it and see what happens.

Best regards,
Vlado