我正在尝试使用 Assimp 加载一个简单的八面体。这就是模型应该看起来的样子：
但是，这是我的代码呈现的内容：
显然，这是不正确的。我不确定我的代码哪里出了问题，尽管我怀疑是 OpenGL 而不是 Assimp 代码。
这是我的代码：
auto scene = scoped!AssimpScene(assimp,"octahedron.obj",aiProcessPreset_TargetRealtime_Fast);
auto mesh = scene.scene().mMeshes[0];
auto vertex = new float[mesh.mNumFaces*3*3];
auto normal = new float[mesh.mNumFaces*3*3];
int b = 0;
for(int i = 0; i < mesh.mNumFaces;i++)
{
auto face = mesh.mFaces[i];
for(int j = 0; j < 3; j++)
{
auto va = cast(float[3])mesh.mVertices[face.mIndices[j]];
vertex[b..b+3] = va;
auto n = cast(float[3])mesh.mNormals[face.mIndices[j]];
normal[b..b+3] = n;
b+=3;
}
}
while(!sdl2.keyboard().isPressed(SDLK_ESCAPE))
{
sdl2.processEvents();
//clear screen
glViewport(0, 0, width,height);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3,GL_FLOAT,0,cast(const(void*))vertex);
glNormalPointer(GL_FLOAT,0,cast(const(void*))normal);
glDrawArrays(GL_TRIANGLES,0,mesh.mNumFaces*3);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
window.swapBuffers();
}
scene.close();
assimp.close();
}
代码断断续续，可以大大改进，虽然我对 OpenGL 很陌生，所以我不确定到底如何。在这方面的任何建议将不胜感激！
以下是运行时产生的日志供参考：
2014-10-14T17:19:26.0681112:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Load octahedron.obj
2014-10-14T17:19:26.0681631:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: Assimp 3.0.1262 amd64 gcc debug shared singlethreaded
2014-10-14T17:19:26.0681916:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Found a matching importer for this file format
2014-10-14T17:19:26.0682121:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Import root directory is './'
2014-10-14T17:19:26.0682681:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Entering post processing pipeline
2014-10-14T17:19:26.0682903:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: GenUVCoordsProcess begin
2014-10-14T17:19:26.0683055:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: GenUVCoordsProcess finished
2014-10-14T17:19:26.0683206:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: TriangulateProcess begin
2014-10-14T17:19:26.0683351:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: TriangulateProcess finished. There was nothing to be done.
2014-10-14T17:19:26.0683503:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: SortByPTypeProcess begin
2014-10-14T17:19:26.0683655:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Points: 0, Lines: 0, Triangles: 1, Polygons: 0 (Meshes, X = removed)
2014-10-14T17:19:26.0683812:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: SortByPTypeProcess finished
2014-10-14T17:19:26.0683975:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: GenFaceNormalsProcess begin
2014-10-14T17:19:26.0684129:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: GenFaceNormalsProcess finished. Face normals have been calculated
2014-10-14T17:19:26.0684297:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: Generate spatially-sorted vertex cache
2014-10-14T17:19:26.0684487:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: CalcTangentsProcess begin
2014-10-14T17:19:26.068466:assimp.d:loggingCallbackAssimp:149
info: assimp: Error, T0: Failed to compute tangents; need UV data in channel0
2014-10-14T17:19:26.0684825:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: CalcTangentsProcess finished
2014-10-14T17:19:26.0684983:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: JoinVerticesProcess begin
2014-10-14T17:19:26.0685253:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: Mesh 0 (unnamed) | Verts in: 24 out: 24 | ~0%
2014-10-14T17:19:26.0685428:assimp.d:loggingCallbackAssimp:149
info: assimp: Debug, T0: JoinVerticesProcess finished
2014-10-14T17:19:26.0685593:assimp.d:loggingCallbackAssimp:149
info: assimp: Info, T0: Leaving post processing pipeline