Annotation of /trunk/rtest/tests/sum-ghp/sum-ghp.diderot

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Revision 1194 - (view) (download)

1 :	glk	1192
2 :	glk	1194	// sum-ghp:
3 :			//
4 :			// does summation of view-space components of Hessian • gradient
5 :
6 :	glk	1192	vec3 camEye = [6.65584, 13.2759, 8.55225];
7 :			vec3 camAt = [0.0, 0.0, 0.0];
8 :			vec3 camUp = [0.0, 0.0, 1.0];
9 :			real camNear = -1.0;
10 :			real camFar = 1.0;
11 :			real camFOV = 6.0;
12 :			int imgResU = 320;
13 :			int imgResV = 240;
14 :	glk	1193	real rayStep = 0.06; // HEY: this is large only because program is slow
15 :	glk	1192
16 :			real camDist = |camAt - camEye|;
17 :			real camVspNear = camNear + camDist;
18 :			real camVspFar = camFar + camDist;
19 :			vec3 camN = normalize(camAt - camEye);
20 :			vec3 camU = normalize(camN × camUp);
21 :			vec3 camV = camN × camU;
22 :			real camVmax = tan(camFOV*π/360.0)*camDist;
23 :			real camUmax = camVmax*real(imgResU)/real(imgResV);
24 :
25 :			field#2(3)[] F = bspln3 ⊛ load("../../data/ring.nrrd");
26 :
27 :			strand RayCast (int ui, int vi) {
28 :			real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
29 :			real rayV = lerp(-camVmax, camVmax, -0.5, real(vi), real(imgResV)-0.5);
30 :			vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
31 :
32 :			real rayN = camVspNear;
33 :			output vec3 sum = [0.0,0.0,0.0];
34 :
35 :			update {
36 :			vec3 rayPos = camEye + rayN*rayVec;
37 :			if (inside (rayPos,F)) {
38 :			vec3 prod = ∇(∇F)(rayPos) • ∇F(rayPos);
39 :			sum = sum + [prod•camU, prod•camV, prod•camN];
40 :			}
41 :			if (rayN > camVspFar)
42 :			stabilize;
43 :			rayN = rayN + rayStep;
44 :			}
45 :			}
46 :
47 :			initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];

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