void GameObject::render(const ngVector3 *lightDirWorld, const ngVector3 *skyBottomColor, float fogFar, float lightStrength, const ngVector3 *eyePosWorld) {
	ngUseShader(shader);
	//set shader parameters
	shaderParameters(skyBottomColor, fogFar, lightStrength);
	// Render all meshes
	for(int i=0; i<model->numMeshes; i++) {
		glPushMatrix();
		transform(i);
		render_afterTransform(lightDirWorld, eyePosWorld);
		draw(i);
		glPopMatrix();
	}
}

void GameObject::zRender() {
	ngUseShader(zShader);
	zShaderParameters();
	// Render all meshes
	for(int i=0; i<model->numMeshes; i++) {
		glPushMatrix();
		transform(i);
		zRender_afterTransform();
		draw(i);
		glPopMatrix();
	}
}

void GameObject::zRender2(GLuint shadowmap) {
	ngUseShader(zShader2);
	zShader2Parameters();
	// Render all meshes
	for(int i=0; i<model->numMeshes; i++) {
		glPushMatrix();
		transform(i);
		zRender2_afterTransform();
		draw(i);
		glPopMatrix();
	}
}