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// libMeshb 7 basic example:
// read a Q2 quad mesh while using the automatic HO reordering feature,
// split it into P2 triangles and write the result back using fast block transfer
#include <stdio.h>
#include <stdlib.h>
#include <libmeshb7.h>
#ifdef PRINTF_INT64_MODIFIER
#define INT64_T_FMT "%" PRINTF_INT64_MODIFIER "d"
#else
# ifdef GMF_WINDOWS
# define INT64_T_FMT "%Id"
# else
# include <inttypes.h>
# define INT64_T_FMT "%" PRId64
# endif
#endif
int main()
{
int i, NmbVer, NmbQad, ver, dim, *RefTab, (*QadTab)[10], (*TriTab)[7];
int BasOrd[9][2] = { {0,0}, {1,0}, {2,0}, {0,1}, {1,1}, {2,1}, {0,2}, {1,2}, {2,2} };
int FilOrd[9][2];
int64_t InpMsh, OutMsh;
float (*VerTab)[3];
/*-----------------------------------*/
/* Open mesh file "quad_q2.meshb" */
/*-----------------------------------*/
if(!(InpMsh = GmfOpenMesh("../sample_meshes/quad_q2.meshb", GmfRead, &ver, &dim)))
return(1);
printf("InpMsh : idx = "INT64_T_FMT", version = %d, dimension = %d\n", InpMsh, ver, dim);
if(dim != 3)
exit(1);
// Read the number of vertices and allocate memory
NmbVer = (int)GmfStatKwd(InpMsh, GmfVertices);
printf("InpMsh : nmb vertices = %d\n", NmbVer);
VerTab = malloc((NmbVer+1) * 3 * sizeof(float));
RefTab = malloc((NmbVer+1) * sizeof(int));
// Read the number of Q2 quads and allocate memory
NmbQad = (int)GmfStatKwd(InpMsh, GmfQuadrilateralsQ2);
printf("InpMsh : nmb Q2 quads = %d\n", NmbQad);
QadTab = malloc((NmbQad+1) * 10 * sizeof(int));
TriTab = malloc((NmbQad+1) * 2 * 7 * sizeof(int));
// Read the optional Q2 quad node ordering information and pass it
// to the library along our internal coding to automatically reorder the nodes
if(GmfStatKwd(InpMsh, GmfQuadrilateralsQ2Ordering))
{
GmfGetBlock(InpMsh, GmfQuadrilateralsQ2Ordering, 1, 9, 0, NULL, NULL,
GmfIntTab, 9, FilOrd[0], FilOrd[8]);
GmfSetHONodesOrdering(InpMsh, GmfQuadrilateralsQ2, (int *)BasOrd, (int *)FilOrd);
}
/*
for(i=0;i<9;i++){
printf ("i=%d BasOrd: i=%d j=%d - FilOrd: i=%d j=%d \n", i+1,BasOrd[i][0],BasOrd[i][1], FilOrd[i][0],FilOrd[i][1]);
}
*/
// Read the vertices
GmfGetBlock(InpMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfFloat, &VerTab[1][0], &VerTab[ NmbVer ][0],
GmfFloat, &VerTab[1][1], &VerTab[ NmbVer ][1],
GmfFloat, &VerTab[1][2], &VerTab[ NmbVer ][2],
GmfInt, &RefTab[1], &RefTab[ NmbVer ] );
// Read the Q2 quads
GmfGetBlock(InpMsh, GmfQuadrilateralsQ2, 1, NmbQad, 0, NULL, NULL,
GmfIntTab, 10, QadTab[1], QadTab[ NmbQad ]);
/*
i=1;
printf ("Quad1 %d %d %d %d %d %d %d %d %d\n", QadTab[i][0], QadTab[i][1], QadTab[i][2], QadTab[i][3], QadTab[i][4], QadTab[i][5], QadTab[i][6], QadTab[i][7], QadTab[i][8]);
*/
// Close the quad mesh
GmfCloseMesh(InpMsh);
/*-----------------------------------*/
/* Create the triangulated P2 mesh */
/*-----------------------------------*/
for(i=1;i<=NmbQad;i++)
{
TriTab[i*2-1][0] = QadTab[i][0];
TriTab[i*2-1][1] = QadTab[i][2];
TriTab[i*2-1][2] = QadTab[i][8];
TriTab[i*2-1][3] = QadTab[i][1];
TriTab[i*2-1][4] = QadTab[i][5];
TriTab[i*2-1][5] = QadTab[i][4];
TriTab[i*2-1][6] = QadTab[i][9];
TriTab[i*2][0] = QadTab[i][0];
TriTab[i*2][1] = QadTab[i][8];
TriTab[i*2][2] = QadTab[i][6];
TriTab[i*2][3] = QadTab[i][4];
TriTab[i*2][4] = QadTab[i][7];
TriTab[i*2][5] = QadTab[i][3];
TriTab[i*2][6] = QadTab[i][9];
}
/*-----------------------------------*/
/* Write the P2 triangle mesh */
/*-----------------------------------*/
if(!(OutMsh = GmfOpenMesh("tri_p2.meshb", GmfWrite, ver, dim)))
return(1);
// Write the vertices
GmfSetKwd(OutMsh, GmfVertices, NmbVer);
GmfSetBlock(OutMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfFloat, &VerTab[1][0], &VerTab[ NmbVer ][0],
GmfFloat, &VerTab[1][1], &VerTab[ NmbVer ][1],
GmfFloat, &VerTab[1][2], &VerTab[ NmbVer ][2],
GmfInt, &RefTab[1], &RefTab[ NmbVer ] );
// Write the triangles
GmfSetKwd(OutMsh, GmfTrianglesP2, 2*NmbQad);
GmfSetBlock(OutMsh, GmfTrianglesP2, 1, 2*NmbQad, 0, NULL, NULL,
GmfIntTab, 7, TriTab[1], TriTab[ 2*NmbQad ]);
// Do not forget to close the mesh file
GmfCloseMesh(OutMsh);
printf("OutMsh : nmb triangles = %d\n", 2*NmbQad);
free(QadTab);
free(TriTab);
free(RefTab);
free(VerTab);
return(0);
}
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