This is a shader script that shades shell1.

    
BEGIN_SHADER
    glEnable(NGL_DEPTH_TEST);

	glEnable(NGL_BLEND);
	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
	
	glColor(0.4,0.4,0.8,0.3);
END_SHADER

