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[37] | 1 | /* |
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| 2 | * Name: edge.c |
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| 3 | * |
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| 4 | * Coded: Brian Curless 10/24/95 |
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| 5 | * |
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| 6 | * Comment: Initializes edge table containing triangle locations. |
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| 7 | */ |
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| 8 | |
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| 9 | |
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| 10 | #include <stdio.h> |
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| 11 | #include <stdlib.h> |
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| 12 | #include <limits.h> |
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| 13 | #include "mc.h" |
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| 14 | #include "lorensen_cases.h" |
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| 15 | |
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| 16 | |
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| 17 | /* This version of InitEdgeTable uses Bill Lorensen's edge table */ |
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| 18 | |
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| 19 | |
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| 20 | void InitEdgeTable() |
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| 21 | { |
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| 22 | int i, ntris; |
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| 23 | Index index; |
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| 24 | EDGE_LIST *edges, edge; |
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| 25 | |
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| 26 | for (index = 0; index < 256; index++) { |
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| 27 | |
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| 28 | edges = poly_cases[index].edges; |
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| 29 | ntris = 0; |
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| 30 | while (ntris < 5) { |
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| 31 | if (edges[ntris*4] == 0 && edges[ntris*4+1] == 0 |
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| 32 | && edges[ntris*4+2] == 0) |
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| 33 | break; |
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| 34 | |
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| 35 | ntris++; |
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| 36 | } |
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| 37 | |
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| 38 | TheEdgeTable[index].Ntriangles = ntris; |
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| 39 | if (ntris == 0) |
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| 40 | continue; |
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| 41 | |
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| 42 | |
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| 43 | TheEdgeTable[index].TriangleList = |
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| 44 | (Triple *) calloc(ntris, sizeof(Triple)); |
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| 45 | |
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| 46 | for (i = 0; i < 12; i++) |
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| 47 | (TheEdgeTable[index].edge)[i] = FALSE; |
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| 48 | |
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| 49 | for (i = 0; i < ntris; i++) { |
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| 50 | edge = edges[i*4]-1; |
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| 51 | TheEdgeTable[index].TriangleList[i].A = edge; |
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| 52 | TheEdgeTable[index].edge[edge] = TRUE; |
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| 53 | |
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| 54 | edge = edges[i*4+1]-1; |
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| 55 | TheEdgeTable[index].TriangleList[i].B = edge; |
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| 56 | TheEdgeTable[index].edge[edge] = TRUE; |
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| 57 | |
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| 58 | edge = edges[i*4+2]-1; |
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| 59 | TheEdgeTable[index].TriangleList[i].C = edge; |
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| 60 | TheEdgeTable[index].edge[edge] = TRUE; |
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| 61 | } |
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| 62 | } |
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| 63 | } /* InitEdgeTable */ |
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