Revision 1e667536
Added by Leszek Koltunski almost 4 years ago
| src/main/res/raw/main_vertex_shader.glsl | ||
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| 75 | 75 |
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| 76 | 76 |
float degree(in vec4 region, in vec3 PS) |
| 77 | 77 |
{
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vec3 PO = PS + region.xyz; |
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float D = region.w*region.w-dot(PO,PO); // D = |OX|^2 - |PO|^2 |
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float ps_sq = dot(PS,PS); |
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| 80 | 79 |
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if( D<=0.0 ) return 0.0;
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if( ps_sq==0.0 ) return 1.0;
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| 82 | 81 |
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float ps_sq = dot(PS,PS); |
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float one_over_ps_sq = 1.0/(ps_sq-(sign(ps_sq)-1.0)); // return 1.0 if ps_sq = 0.0 |
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// Important: if we want to write |
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// b = 1/a if a!=0, b=1 otherwise |
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// we need to write that as |
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// b = 1 / ( a-(sign(a)-1) ) |
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// [ and NOT 1 / ( a + 1 - sign(a) ) ] |
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// because the latter, if 0<a<2^-24, |
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// will suffer from round-off error and in this case |
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// a + 1.0 = 1.0 !! so 1 / (a+1-sign(a)) = 1/0 ! |
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float DOT = dot(PS,PO)*one_over_ps_sq; |
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return 1.0 / (1.0 + 1.0/(sqrt(DOT*DOT+D*one_over_ps_sq)-DOT)); |
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vec3 PO = PS + region.xyz; |
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float d = region.w*region.w-dot(PO,PO); |
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if( d<=0.0 ) return 0.0; |
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float b = dot(PS,PO)/ps_sq; |
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return 1.0 / (1.0 + 1.0/(sqrt(b*b + d/ps_sq)-b)); |
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| 96 | 90 |
} |
| 97 | 91 |
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| 98 | 92 |
#endif // NUM_VERTEX>0 |
Also available in: Unified diff
1) Cube: convert it to the latest library. Main difference: objects are rendered better, individual cubits have rounded corners.
2) Examples: some adjustments to MeshJoin & Predeform
3) Library: fix a bug in main_vertex_shader's 'degree' function, which didn't work proprely in case of a vertex which was exactly at the center (i.e. vector PS was zero)