public SimpleDiffuse()
{
shaderProg = new ShaderProg("diffuse_vs.glsl", "diffuse_fs.glsl", true);
_uniformHelper = new UniformHelper();
}
public Pbr()
{
shaderProg = new ShaderProg("vs_norm.glsl", "fs_PBR_gltf_pipeline_with_maps.glsl", true);
_uniformHelper = new UniformHelper();
}