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$input v_texcoord0
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#include "terrain_common.sh"
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void main()
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{
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vec2 s = texture2D(u_SmapSampler, v_texcoord0).rg * u_DmapFactor;
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vec3 n = normalize(vec3(-s, 1));
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float d = clamp(n.z, 0.0, 1.0) / 3.14159;
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vec3 r = vec3(d, d, d);
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gl_FragColor = vec4(r, 1);
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}
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