本文整理汇总了C++中PVRTVec3::cross方法的典型用法代码示例。如果您正苦于以下问题：C++ PVRTVec3::cross方法的具体用法？C++ PVRTVec3::cross怎么用？C++ PVRTVec3::cross使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类PVRTVec3的用法示例。
在下文中一共展示了PVRTVec3::cross方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: ComputeVertexAndNormals
void ParametricSurface::ComputeVertexAndNormals(PFUNCTION function, float dMinU, float dMaxU, float dMinV, float dMaxV)
{
int nVertex = nSampleU * nSampleV;
pVertex = new float[nVertex*3];
pNormal = new float[nVertex*3];
pUV = new float[nVertex*2];
fMinU = dMinU;
fMaxU = dMaxU;
fMinV = dMinV;
fMaxV = dMaxV;
for (int i=0; i<nSampleU; i++)
{
for (int j=0; j<nSampleV; j++)
{
float u = fMinU + i * (fMaxU-fMinU) / (float)(nSampleU-1);
float v = fMinV + j * (fMaxV-fMinV) / (float)(nSampleV-1);
float x,y,z;
function(u,v, &x,&y,&z);
pVertex[(j*nSampleU+i)*3 + 0] = x;
pVertex[(j*nSampleU+i)*3 + 1] = y;
pVertex[(j*nSampleU+i)*3 + 2] = z;
}
}
for (int i=0; i<nSampleU; i++)
{
for (int j=0; j<nSampleV; j++)
{
pUV[ (j*nSampleU+i)*2 + 0 ] = (float)i / (float)(nSampleU-1);
pUV[ (j*nSampleU+i)*2 + 1 ] = (float)j / (float)(nSampleV-1);
}
}
for (int i=0; i<nSampleU-1; i++)
{
for (int j=0; j<nSampleV-1; j++)
{
PVRTVec3 ptA = PVRTVec3(pVertex[(j*nSampleU+i)*3+0],pVertex[(j*nSampleU+i)*3+1],pVertex[(j*nSampleU+i)*3+2]);
PVRTVec3 ptB = PVRTVec3(pVertex[(j*nSampleU+i+1)*3+0],pVertex[(j*nSampleU+i+1)*3+1],pVertex[(j*nSampleU+i+1)*3+2]);
PVRTVec3 ptC = PVRTVec3(pVertex[((j+1)*nSampleU+i)*3+0],pVertex[((j+1)*nSampleU+i)*3+1],pVertex[((j+1)*nSampleU+i)*3+2]);
PVRTVec3 AB = PVRTVec3(ptB.x-ptA.x, ptB.y-ptA.y, ptB.z-ptA.z);
PVRTVec3 AC = PVRTVec3(ptC.x-ptA.x, ptC.y-ptA.y, ptC.z-ptA.z);
PVRTVec3 normal;
normal = AB.cross(AC);
normal.normalize();
pNormal[(j*nSampleU+i)*3 + 0] = -normal.x;
pNormal[(j*nSampleU+i)*3 + 1] = -normal.y;
pNormal[(j*nSampleU+i)*3 + 2] = -normal.z;
}
}
for (int i=0; i<nSampleU-1; i++)
{
pNormal[((nSampleV-1)*nSampleU+i)*3+0] = pNormal[(i)*3+0];
pNormal[((nSampleV-1)*nSampleU+i)*3+1] = pNormal[(i)*3+1];
pNormal[((nSampleV-1)*nSampleU+i)*3+2] = pNormal[(i)*3+2];
}
for (int j=0; j<nSampleV-1; j++)
{
pNormal[(j*nSampleU+nSampleU-1)*3+0] = pNormal[(j*nSampleU)*3+0];
pNormal[(j*nSampleU+nSampleU-1)*3+1] = pNormal[(j*nSampleU)*3+1];
pNormal[(j*nSampleU+nSampleU-1)*3+2] = pNormal[(j*nSampleU)*3+2];
}
pNormal[((nSampleV-1)*nSampleU + (nSampleU-1))*3+0]= pNormal[((nSampleV-2)*nSampleU + (nSampleU-2))*3+0];
pNormal[((nSampleV-1)*nSampleU + (nSampleU-1))*3+1]= pNormal[((nSampleV-2)*nSampleU + (nSampleU-2))*3+1];
pNormal[((nSampleV-1)*nSampleU + (nSampleU-1))*3+2]= pNormal[((nSampleV-2)*nSampleU + (nSampleU-2))*3+2];
// Insert generated data into vertex buffer objects.
glBindBuffer(GL_ARRAY_BUFFER, iVertexVBO);
glBufferData(GL_ARRAY_BUFFER, nVertex * 3 * sizeof (float), pVertex, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, iUvVBO);
glBufferData(GL_ARRAY_BUFFER, nVertex * 2 * sizeof (float), pUV, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, iNormalVBO);
glBufferData(GL_ARRAY_BUFFER, nVertex * 3 * sizeof (float), pNormal, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0); // Unbind the last buffer used.
delete[] pVertex;
delete[] pNormal;
delete[] pUV;
}