/usr/share/radiance/lib/proj.cal is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | {
proj.cal - calculate image projection vector
Example:
cnt 512 512 | rcalc -f proj.cal -e 'x=$1;y=$2' \
-e 'VPx=15.3;VPy=10.1;VPz=-3.3;' \
-e 'VDx=.394;VDy=-.731;VDz=-.053;' \
-e 'VH=30;VV=30;' -e '$1=VPx;$2=VPy;$3=VPz;' \
-e '$4=PDx;$5=PDy;$6=PDz;' | rtrace [rtrace options]
}
{ View Point }
VPx = 0; VPy = 0; VPz = 0;
{ View Up }
VUx = 0; VUy = 0; VUz = 1;
{ View Direction }
VDx = 0; VDy = 1; VDz = 0;
{ View Horizontal and Vertical angles }
VH = 45; VV = 45;
{ X and Y resolution }
X = 512; Y = 512;
{ Projected Direction (computed) }
PDx = NVDx + h*IHx + v*IVx;
PDy = NVDy + h*IHy + v*IVy;
PDz = NVDz + h*IHz + v*IVz;
h = x - (X-1)/2; v = y - (Y-1)/2;
{ Normalized View Direction }
NVDx = VDx/VDl; NVDy = VDy/VDl; NVDz = VDz/VDl;
VDl = sqrt(VDx*VDx + VDy*VDy + VDz*VDz);
{ Increment Horizontal }
IHx = IHF*NTIHx; IHy = IHF*NTIHy; IHz = IHF*NTIHz;
NTIHx = TIHx/TIHl; NTIHy = TIHy/TIHl; NTIHz = TIHz/TIHl;
TIHx = VDy*VUz-VDz*VUy; TIHy = VDz*VUx-VDx*VUz; TIHz = VDx*VUy-VDy*VUx;
TIHl = sqrt(TIHx*TIHx + TIHy*TIHy + TIHz*TIHz);
IHF = 2*tan(PI/180/2*VH)/X;
{ Increment Vertical }
IVx = IVF*(NTIHy*NVDz-NTIHz*NVDy);
IVy = IVF*(NTIHz*NVDx-NTIHx*NVDz);
IVz = IVF*(NTIHx*NVDy-NTIHy*NVDx);
IVF = 2*tan(PI/180/2*VV)/Y;
PI = 3.14159265358979323846;
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