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nuclear@10
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1 #version 120
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nuclear@10
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2
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nuclear@4
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3 uniform sampler3D vol_tex;
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nuclear@4
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4 uniform sampler1D xfer_tex;
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nuclear@4
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5
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nuclear@10
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6 uniform vec3 light_dir[3] = vec3[3](
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nuclear@9
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7 vec3(0.5, 0.5, 1.0),
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nuclear@9
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8 vec3(-1.0, 0.2, 0.5),
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nuclear@9
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9 vec3(-0.2, 0.0, -7.0)
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nuclear@10
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10 );
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nuclear@10
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11 uniform vec3 light_color[3] = vec3[3](
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nuclear@9
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12 vec3(0.9, 0.7, 0.68),
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nuclear@9
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13 vec3(0.5, 0.6, 0.9),
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nuclear@9
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14 vec3(0.3, 0.3, 0.3)
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nuclear@10
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15 );
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nuclear@9
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16
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nuclear@9
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17 const vec3 ambient = vec3(0.1, 0.1, 0.1);
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nuclear@9
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18 const vec3 vdir = vec3(0.0, 0.0, 1.0);
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nuclear@9
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19 const float dimmer = 0.7;
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nuclear@9
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20
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nuclear@4
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21 void main()
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nuclear@4
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22 {
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nuclear@8
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23 vec3 tc = gl_TexCoord[0].xyz;
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nuclear@8
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24 float max_manh_dist = max(tc.x, max(tc.y, tc.z));
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nuclear@8
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25 float min_manh_dist = min(tc.x, min(tc.y, tc.z));
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nuclear@8
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26 float border = step(0.0, min_manh_dist) * (1.0 - step(1.0, max_manh_dist));
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nuclear@8
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27
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nuclear@4
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28 vec4 voxel = texture3D(vol_tex, gl_TexCoord[0].xyz);
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nuclear@4
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29 vec4 color = texture1D(xfer_tex, voxel.a);
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nuclear@4
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30
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nuclear@8
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31 float alpha = color.a * border;
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nuclear@8
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32 if(alpha < 0.001) discard;
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nuclear@8
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33
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nuclear@9
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34 vec3 norm = normalize(voxel.rgb * 2.0 - 1.0);
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nuclear@9
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35
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nuclear@9
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36 vec3 diffuse = vec3(0.0, 0.0, 0.0);
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nuclear@9
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37 vec3 specular = vec3(0.0, 0.0, 0.0);
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nuclear@9
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38
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nuclear@9
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39 for(int i=0; i<3; i++) {
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nuclear@9
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40 vec3 ldir = normalize(light_dir[i]);
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nuclear@9
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41 vec3 hdir = normalize(vdir + ldir);
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nuclear@9
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42
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nuclear@9
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43 float ndotl = max(dot(norm, ldir), 0.0);
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nuclear@9
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44 float ndoth = max(dot(norm, hdir), 0.0);
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nuclear@9
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45
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nuclear@9
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46 diffuse += light_color[i] * color.rgb * ndotl;
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nuclear@9
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47 specular += light_color[i] * vec3(0.6, 0.6, 0.6) * pow(ndoth, 50.0);
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nuclear@9
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48 }
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nuclear@9
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49
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nuclear@9
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50 gl_FragColor.rgb = ambient + (diffuse + specular) * dimmer;
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nuclear@8
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51 gl_FragColor.a = alpha;
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nuclear@4
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52 }
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