| 1 |
greg |
2.9 |
{ RCSid: $Id$ } |
| 2 |
greg |
1.1 |
{ |
| 3 |
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Source distribution coordinates (degrees). |
| 4 |
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| 5 |
greg |
2.6 |
Theta is measured from the negative z-axis. |
| 6 |
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Phi is measured from the positive x-axis (0 degrees) |
| 7 |
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towards the negative y-axis (90 degrees). |
| 8 |
greg |
1.1 |
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| 9 |
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srcB_vert and srcB_horiz are angles |
| 10 |
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used in type B photometry. |
| 11 |
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| 12 |
greg |
2.2 |
boxcorr function corrects for distribution modeled |
| 13 |
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with a rectangular box. lboxcorr provides a more |
| 14 |
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accurate calculation for nearby surfaces, but requires |
| 15 |
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that the source box be centered at the origin. |
| 16 |
greg |
2.5 |
The dimensions of the box, which must be aligned with |
| 17 |
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the x,y,z axes, are given in meters regardless of the |
| 18 |
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units being used in the scene file. |
| 19 |
greg |
2.2 |
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| 20 |
gregl |
2.8 |
cylcorr function provides the same correction for a |
| 21 |
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cylinder whose central axis is aligned with the Z-axis. |
| 22 |
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| 23 |
greg |
1.2 |
A1 - optional multipier |
| 24 |
greg |
2.5 |
A2,A3,A4 - X,Y,Z dimensions of axis-aligned box (in meters!) |
| 25 |
gregl |
2.8 |
or |
| 26 |
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A2,A3 - diameter and height of Z-aligned cylinder (meters) |
| 27 |
greg |
1.1 |
} |
| 28 |
greg |
1.2 |
{ local definitions } |
| 29 |
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boxprojection = abs(Dx)*A3*A4 + abs(Dy)*A2*A4 + abs(Dz)*A2*A3; |
| 30 |
greg |
2.2 |
lboxprojection = ( noneg(abs(Px-Dx*Ts)-A2/2)*A3*A4 + |
| 31 |
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noneg(abs(Py-Dy*Ts)-A3/2)*A2*A4 + |
| 32 |
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noneg(abs(Pz-Dz*Ts)-A4/2)*A2*A3 ) / Ts; |
| 33 |
gregl |
2.8 |
cylprojection = A2*A3*sqrt(1-Dz*Dz) + PI/4*A2*A2*abs(Dz); |
| 34 |
greg |
1.1 |
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| 35 |
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flatcorr(v) = corr(v) / Rdot; { correction for flat sources } |
| 36 |
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corr(v) = if(AC-.5, A1*v, v); { multiplier correction } |
| 37 |
greg |
1.2 |
boxcorr(v) = A1 * v / boxprojection; { correction for emitting box } |
| 38 |
greg |
2.2 |
lboxcorr(v) = A1 * v / lboxprojection; { local box correction } |
| 39 |
gregl |
2.8 |
cylcorr(v) = A1 * v / cylprojection; { cylinder correction } |
| 40 |
greg |
1.1 |
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| 41 |
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src_theta = Acos(Dz) / DEGREE; { 0-180 } |
| 42 |
greg |
2.7 |
src_phi = mod( Atan2(Dy, -Dx) / DEGREE, 360 ); { 0-360 } |
| 43 |
greg |
1.1 |
{ bilateral symmetry } |
| 44 |
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src_phi2 = tri( src_phi, 180 ); { 0-180 } |
| 45 |
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{ quadrilateral symmetry } |
| 46 |
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src_phi4 = tri( src_phi, 90 ); { 0-90 } |
| 47 |
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| 48 |
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{ Type B photometry coordinates } |
| 49 |
greg |
2.9 |
srcB_vert = atan2( -Dx, Dz ) / DEGREE; |
| 50 |
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srcB_horiz = atan2( Dy, Dz ) / DEGREE; |
| 51 |
greg |
2.4 |
{ w/ symmetry } |
| 52 |
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srcB_vert2 = abs( srcB_vert ); |
| 53 |
greg |
1.1 |
srcB_horiz2 = abs( srcB_horiz ); |
