[Andy]

Like lots of things in AC3D 5, ACMaterials are ACEntity.

So, if ACMaterial *m;

ACrgb rgb;
Float val;

   ac_entity_get_rgb_value( (ACEntity *)m, "diffuse", &rgb );
   ac_entity_get_rgb_value( (ACEntity *)m, "ambient", &rgb );
   ac_entity_get_rgb_value( (ACEntity *)m, "specular", &rgb );
   ac_entity_get_rgb_value( (ACEntity *)m, "emissive", &rgb );
   ac_entity_get_float_value( (ACEntity *)m, "shininess", &val );
   ac_entity_get_float_value( (ACEntity *)m, "transparency", &val );