Annotation of /trunk/rtest/tests/mip/mip.diderot

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Revision 1189 - (view) (download)

1 :	glk	1189
2 :			vec3 camEye = [6.65584, 13.2759, 8.55225];
3 :			vec3 camAt = [0.0, 0.0, 0.0];
4 :			vec3 camUp = [0.0, 0.0, 1.0];
5 :			real camNear = -1.0;
6 :			real camFar = 1.0;
7 :			real camFOV = 6.0;
8 :			int imgResU = 320;
9 :			int imgResV = 240;
10 :			real rayStep = 0.01;
11 :
12 :			real camDist = |camAt - camEye|;
13 :			real camVspNear = camNear + camDist;
14 :			real camVspFar = camFar + camDist;
15 :			vec3 camN = normalize(camAt - camEye);
16 :			vec3 camU = normalize(camN × camUp);
17 :			vec3 camV = camN × camU;
18 :			real camVmax = tan(camFOV*π/360.0)*camDist;
19 :			real camUmax = camVmax*real(imgResU)/real(imgResV);
20 :
21 :			field#0(3)[] F = tent ⊛ load("../../data/ring.nrrd");
22 :
23 :			strand RayCast (int ui, int vi) {
24 :			real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
25 :			real rayV = lerp(-camVmax, camVmax, -0.5, real(vi), real(imgResV)-0.5);
26 :			vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
27 :
28 :			real rayN = camVspNear;
29 :			output real maxval = -0.6;
30 :
31 :			update {
32 :			vec3 rayPos = camEye + rayN*rayVec;
33 :			if (inside (rayPos,F)) {
34 :			maxval = max(maxval, F(rayPos));
35 :			}
36 :			if (rayN > camVspFar)
37 :			stabilize;
38 :			rayN = rayN + rayStep;
39 :			}
40 :			}
41 :
42 :			initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];

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