Scarfski/assimp
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Adding samples/SimpleOpenGL.

Browse Source 
Adding basic math functions to the C API. This functionality is exposed to C++ users via operator overloading of aiMatrix4x4, aiMatrix3x3, aiVector3D.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@442 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
This commit is contained in:
aramis_acg
2009-06-20 14:49:49 +00:00
parent 5b2c7d060a
commit cc96f55c61
8 changed files with 627 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
code/ComputeUVMappingProcess.cpp
View File

@@ -184,13 +184,13 @@ void RemoveUVSeams (aiMesh* mesh, aiVector3D* out)
void ComputeUVMappingProcess::ComputeSphereMapping(aiMesh* mesh,const aiVector3D& axis, aiVector3D* out)
{
aiVector3D center, min, max;
FindMeshCenter(mesh, center, min, max);
// If the axis is one of x,y,z run a faster code path. It's worth the extra effort ...
// currently the mapping axis will always be one of x,y,z, except if the
// PretransformVertices step is used (it transforms the meshes into worldspace,
// thus changing the mapping axis)
if (axis * base_axis_x >= angle_epsilon) {
FindMeshCenter(mesh, center, min, max);
// For each point get a normalized projection vector in the sphere,
// get its longitude and latitude and map them to their respective
@@ -204,48 +204,38 @@ void ComputeUVMappingProcess::ComputeSphereMapping(aiMesh* mesh,const aiVector3D
// Thus we can derive:
// lat = arcsin (z)
// lon = arctan (y/x)
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt)
{
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt) {
const aiVector3D diff = (mesh->mVertices[pnt]-center).Normalize();
out[pnt] = aiVector3D((atan2 (diff.z, diff.y) + (float)AI_MATH_PI ) / (float)AI_MATH_TWO_PI,
(asin (diff.x) + (float)AI_MATH_HALF_PI) / (float)AI_MATH_PI, 0.f);
out[pnt] = aiVector3D((atan2 (diff.z, diff.y) + AI_MATH_PI_F ) / AI_MATH_TWO_PI_F,
(asin (diff.x) + AI_MATH_HALF_PI_F) / AI_MATH_PI_F, 0.f);
}
}
else if (axis * base_axis_y >= angle_epsilon) {
FindMeshCenter(mesh, center, min, max);
// ... just the same again
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt)
{
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt) {
const aiVector3D diff = (mesh->mVertices[pnt]-center).Normalize();
out[pnt] = aiVector3D((atan2 (diff.x, diff.z) + (float)AI_MATH_PI ) / (float)AI_MATH_TWO_PI,
(asin (diff.y) + (float)AI_MATH_HALF_PI) / (float)AI_MATH_PI, 0.f);
out[pnt] = aiVector3D((atan2 (diff.x, diff.z) + AI_MATH_PI_F ) / AI_MATH_TWO_PI_F,
(asin (diff.y) + AI_MATH_HALF_PI_F) / AI_MATH_PI_F, 0.f);
}
}
else if (axis * base_axis_z >= angle_epsilon) {
FindMeshCenter(mesh, center, min, max);
// ... just the same again
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt)
{
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt) {
const aiVector3D diff = (mesh->mVertices[pnt]-center).Normalize();
out[pnt] = aiVector3D((atan2 (diff.y, diff.x) + (float)AI_MATH_PI ) / (float)AI_MATH_TWO_PI,
(asin (diff.z) + (float)AI_MATH_HALF_PI) / (float)AI_MATH_PI, 0.f);
out[pnt] = aiVector3D((atan2 (diff.y, diff.x) + AI_MATH_PI_F ) / AI_MATH_TWO_PI_F,
(asin (diff.z) + AI_MATH_HALF_PI_F) / AI_MATH_PI_F, 0.f);
}
}
// slower code path in case the mapping axis is not one of the coordinate system axes
else
{
else {
aiMatrix4x4 mTrafo;
aiMatrix4x4::FromToMatrix(axis,base_axis_y,mTrafo);
FindMeshCenterTransformed(mesh, center, min, max,mTrafo);
// again the same, except we're applying a transformation now
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt)
{
for (unsigned int pnt = 0; pnt < mesh->mNumVertices;++pnt) {
const aiVector3D diff = ((mTrafo*mesh->mVertices[pnt])-center).Normalize();
out[pnt] = aiVector3D((atan2 (diff.y, diff.x) + (float)AI_MATH_PI ) / (float)AI_MATH_TWO_PI,
(asin (diff.z) + (float)AI_MATH_HALF_PI) / (float)AI_MATH_PI, 0.f);
out[pnt] = aiVector3D((atan2 (diff.y, diff.x) + AI_MATH_PI_F ) / AI_MATH_TWO_PI_F,
(asin (diff.z) + AI_MATH_HALF_PI_F) / AI_MATH_PI_F, 0.f);
}
}