mirror of
https://github.com/bulletphysics/bullet3
synced 2024-12-14 22:00:05 +00:00
110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
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#ifndef LOAD_MESH_FROM_STL_H
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#define LOAD_MESH_FROM_STL_H
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#include "../OpenGLWindow/GLInstanceGraphicsShape.h"
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#include <stdio.h> //fopen
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#include "Bullet3Common/b3AlignedObjectArray.h"
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struct MySTLTriangle
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{
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float normal[3];
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float vertex0[3];
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float vertex1[3];
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float vertex2[3];
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};
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static GLInstanceGraphicsShape* LoadMeshFromSTL(const char* relativeFileName)
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{
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GLInstanceGraphicsShape* shape = 0;
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FILE* file = fopen(relativeFileName,"rb");
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if (file)
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{
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int size=0;
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if (fseek(file, 0, SEEK_END) || (size = ftell(file)) == EOF || fseek(file, 0, SEEK_SET))
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{
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printf("Error: Cannot access file to determine size of %s\n", relativeFileName);
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} else
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{
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if (size)
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{
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printf("Open STL file of %d bytes\n",size);
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char* memoryBuffer = new char[size+1];
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int actualBytesRead = fread(memoryBuffer,1,size,file);
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if (actualBytesRead!=size)
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{
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printf("Error reading from file %s",relativeFileName);
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} else
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{
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int numTriangles = *(int*)&memoryBuffer[80];
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if (numTriangles)
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{
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{
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//perform a sanity check instead of crashing on invalid triangles/STL files
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int expectedBinaryFileSize = numTriangles* 50 + 84;
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if (expectedBinaryFileSize != size)
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{
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return 0;
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}
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}
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shape = new GLInstanceGraphicsShape;
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// b3AlignedObjectArray<GLInstanceVertex>* m_vertices;
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// int m_numvertices;
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// b3AlignedObjectArray<int>* m_indices;
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// int m_numIndices;
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// float m_scaling[4];
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shape->m_scaling[0] = 1;
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shape->m_scaling[1] = 1;
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shape->m_scaling[2] = 1;
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shape->m_scaling[3] = 1;
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int index = 0;
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shape->m_indices = new b3AlignedObjectArray<int>();
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shape->m_vertices = new b3AlignedObjectArray<GLInstanceVertex>();
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for (int i=0;i<numTriangles;i++)
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{
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char* curPtr = &memoryBuffer[84+i*50];
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MySTLTriangle* tri = (MySTLTriangle*) curPtr;
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GLInstanceVertex v0,v1,v2;
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if (i==numTriangles-2)
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{
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printf("!\n");
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}
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v0.uv[0] = v1.uv[0] = v2.uv[0] = 0.5;
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v0.uv[1] = v1.uv[1] = v2.uv[1] = 0.5;
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for (int v=0;v<3;v++)
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{
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v0.xyzw[v] = tri->vertex0[v];
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v1.xyzw[v] = tri->vertex1[v];
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v2.xyzw[v] = tri->vertex2[v];
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v0.normal[v] = v1.normal[v] = v2.normal[v] = tri->normal[v];
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}
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v0.xyzw[3] = v1.xyzw[3] = v2.xyzw[3] = 0.f;
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shape->m_vertices->push_back(v0);
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shape->m_vertices->push_back(v1);
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shape->m_vertices->push_back(v2);
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shape->m_indices->push_back(index++);
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shape->m_indices->push_back(index++);
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shape->m_indices->push_back(index++);
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}
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}
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}
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delete[] memoryBuffer;
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}
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}
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fclose(file);
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}
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shape->m_numIndices = shape->m_indices->size();
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shape->m_numvertices = shape->m_vertices->size();
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return shape;
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}
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#endif //LOAD_MESH_FROM_STL_H
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