eleni@23: uniform sampler2D depth_tex;
eleni@24: varying float mask;
eleni@23: 
eleni@23: void main()
eleni@23: {
eleni@24: 	const float threshold = 0.8;
eleni@24: 	const float scale = 4.0;
eleni@24: 
eleni@24: 	float texel = texture2D(depth_tex, gl_MultiTexCoord0.xy).r;
eleni@23: 	vec4 vpos = gl_Vertex;
eleni@24: 	mask = 1.0 - step(threshold, texel);
eleni@24: 	vpos.z = texel * mask * scale;
eleni@23: 
eleni@23: 	gl_Position = gl_ModelViewProjectionMatrix * vpos;
eleni@23: 	gl_TexCoord[0] = gl_MultiTexCoord0;
eleni@23: }