| 1 |
greg |
2.1 |
{ RCSid $Id$ } |
| 2 |
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{ |
| 3 |
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Compute patterns for ambient position markers |
| 4 |
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} |
| 5 |
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{ Relative hit point } |
| 6 |
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rpx = Px - arg(1); |
| 7 |
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rpy = Py - arg(2); |
| 8 |
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rpz = Pz - arg(3); |
| 9 |
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| 10 |
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{ Calculation of directional gradient pattern } |
| 11 |
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ndx = arg(4); ndy = arg(5); ndz = arg(6); |
| 12 |
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dgx = arg(7); dgy = arg(8); dgz = arg(9); |
| 13 |
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dg = sqrt(dgx*dgx + dgy*dgy + dgz*dgz); |
| 14 |
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dux = (ndy*dgz - ndz*dgy)/dg; |
| 15 |
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duy = (ndz*dgx - ndx*dgz)/dg; |
| 16 |
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duz = (ndx*dgy - ndy*dgx)/dg; |
| 17 |
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dsine = (dux*rpx + duy*rpy + duz*rpz)/sqrt(rpx*rpx + rpy*rpy + rpz*rpz); |
| 18 |
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dirfunc = bound(0, 1 + dg*dsine, 2); |
| 19 |
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| 20 |
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{ Calculation of positional gradient pattern } |
| 21 |
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pgx = arg(4); pgy = arg(5); pgz = arg(6); |
| 22 |
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posfunc = bound(0, 1 + (pgx*rpx + pgy*rpy + pgz*rpz), 2); |
| 23 |
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| 24 |
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{ Calculation of ellipse stencil for base } |
| 25 |
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usx = arg(4); usy = arg(5); usz = arg(6); |
| 26 |
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vsx = arg(7); vsy = arg(8); vsz = arg(9); |
| 27 |
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ellipstencil = if(1 - sq(usx*rpx + usy*rpy + usz*rpz) - sq(vsx*rpx + vsy*rpy + vsz*rpz), |
| 28 |
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1, 0); |
