Assign per face shaders

[lcrivell]

Hi,
I tried to implement this type but struggle a bit to understand the different types. Below my piece of code that doesn't even compile. Would you have any hint/correct for me ?

            DefMapChannelsParam param_uvs("map_channels",1);
            MapChannel oneMapChannel=param_uvs.getMapChannels();
            
            VectorRefList VL;
            IntList IL;
            IL.setCount(nbFaces);
            VL.setCount(nbFaces);
            for (int i=0;i<nbFaces;i++)
            {
                VL[i]=Vector(myU[i],0.0f, myV[i]);
                IL[i]=i;
            }
            oneMapChannel.setVerts(VL);
            oneMapChannel.setFaces(IL);
            
            baseGeomPlugin->setParameter(param_vs);

Thanks for your hints !

[vlado]

Something like that:

            DefMapChannelsParam param_uvs("map_channels",1);
            MapChannelList &mapChannelsList=param_uvs.getMapChannels();
            
            DefMapChannelsParam::MapChannel &chan=(*(mapChannelsList.newElement()));
        
            chan.idx=0;
            chan.verts.setCount(nbFaces);
            chan.faces.setCount(nbFaces*3);    

            for (int i=0;i<nbFaces;i++) {
                chan.verts[i]=Vector(myU[i],0.0f, myV[i]);
                chan.faces[i*3+0]=i;
                chan.faces[i*3+1]=i;
                chan.faces[i*3+2]=i;
            }
            
            baseGeomPlugin->setParameter(param_uvs);

Best regards,
Vlado

[lcrivell]

Thanks. Will give it a try !

[lcrivell]

Apart from adding a & into baseGeomPlugin->setParameter(&param_uvs), it now compiles fine.
However the rendering crashes. If I remove this setParameter, then no crash anymore.
What could be wrong ? I again checked that the amount of uvs is indeed the same as the amount of vertices, which is the case.
Even by simply doing this:

            DefMapChannelsParam param_uvs("map_channels",1);
            baseGeomPlugin->setParameter(&param_uvs);

then it is crashing

[vlado]

The problem is that you are creating the parameter on the stack; if you only need one instance of the parameter, you can make it a member of your class, otherwise, create it on the heap using operator new() - you'll have to remember to delete it after the rendering though.

Best regards,
Vlado

[lcrivell]

You are my hero, thanks !!