nuclear@6: uniform sampler3D volume;
nuclear@6: uniform sampler1D xfer_tex;
nuclear@6: 
nuclear@6: void main()
nuclear@6: {
nuclear@9: 	float val = texture3D(volume, gl_TexCoord[0].xyz).a;
nuclear@6: 	gl_FragColor = vec4(texture1D(xfer_tex, val).xxx, 1.0);
nuclear@6: }