Getting/Setting the material effectID in VRayMtl

[duke2]

I've made a few helper functions in .NET to scan xref scenes (recursively) for object and material id's. Obviously the regular method doesn't work with VRayMtl override effect id. Where abouts do I get this? I printed out all the pblocks and didn't see anything obvious.

If it matters, we're using VRay 2.4 here.

[duke2]

Nothing? I'm also using a GUP done in C++ so I just would like to know what property I should be looking up. I'm not tied to c#.

[vlado]

It should work fine, from MaxScript at least. The parameters are called "effect_id" and "override_effect_id"

Best regards,
Vlado

[duke2]

Oh I know it works from maxscript - I'm trying to get it from C++.

[vlado]

Something like this should work:

enum {
	vrayMtl_basic_id=1,
	vrayMtl_BRDF_id,
	vrayMtl_options_id,
	vrayMtl_maps_id,
	vrayMtl_reflIMap_id,
	vrayMtl_refrIMap_id,
};

enum {
	pb_effect_id=78,
	pb_override_effect_id,
};

...
Mtl *mtl=...;
if (mtl) {
	IParamBlock2 *pblockOptions=mtl->GetParamBlockByID(vrayMtl_options_id);
	if (pblockOptions) {
		int effectID=pblockOptions->GetInt(pb_effect_id);
		int overrideEffectID=pblockOptions->GetInt(pb_override_effect_id);
	}
}

Best regards,
Vlado

[duke2]

Brilliant, tested and works - thanks Vlado. Here's the C# code if anyone is interested:

public static IClass_ID CLASSID_VRAYMTL = GlobalInterface.Instance.Class_ID.Create(935280431, 1882483036);

public static int GetVRayEffectId(IMtl mtl)
{
    if (mtl.ClassID.OperatorNotEquals(CLASSID_VRAYMTL) == 1)
        return -1;

    var effectId = -1;
    var overrideEffectId = -1;

    var pblock = mtl.GetParamBlockByID(3);
    if(pblock != null)
    {
        effectId = pblock.GetInt(78, GlobalInterface.Instance.COREInterface14.Time, 0);
        overrideEffectId = pblock.GetInt(79, GlobalInterface.Instance.COREInterface14.Time, 0);
    }

    return overrideEffectId == 1 ? effectId : (int) mtl.GBufID;
}