Question

When I load an .obj file in GMax it is positioned in the center of the space (0,0,0).
How can I change this position? Is there any special function?

I don’t want to use glTranslatef. Rather I would like the whole pModel to move (the pModel structure to change). I found the function glmScale. Is there anything similar for translating or rotating?

When I load the obj I do smth like this:

pModelScaun=glmReadOBJ(filename);   
glmUnitize(pModelScaun);
glmFacetNormals(pModelScaun);
glmVertexNormals(pModelScaun,90.0);

and then I use the triangle to determine the light position and the shadow frascum

for (unsigned int i = 0; i < pModelScaun->numtriangles; i++)
{
    //compute the light vector (between the center of the current 
    //triangle and the position of the light (converted to object space)
    for (unsigned int j = 0; j < 3; j++)
    {
        fvIncidentLightDir[j] = (pModelScaun->vertices[3*pModelScaun->triangles[i].vindices[0]+j] +
                                pModelScaun->vertices[3*pModelScaun->triangles[i].vindices[1]+j] +
                                pModelScaun->vertices[3*pModelScaun->triangles[i].vindices[2]+j]) / 3.0 - lp[j];            
    }

Can you point me a way in which I could use the transformation matrices in this situation?

Answer 1

Since you have are using the vertices in object-space, and have transformed the light into their object-space, you can multiply the fvIncidentLightDir by your object’s transformation matrix to transform it back into world space.