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3d X11 projection example

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Jiri Pittner
2023-04-08 20:05:45 +02:00
parent c24efe43a1
commit 072888e2d5
3 changed files with 65 additions and 36 deletions
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6
vecmat3.cc
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@@ -844,9 +844,9 @@ return sqrt(sum);
//cf. https://en.wikipedia.org/wiki/3D_projection
template<typename T>
void perspective(T *proj_xy, const Vec3<T> &point, const Mat3<T> &camera_angle, const Vec3<T> &camera, const Vec3<T> &plane_to_camera)
void perspective(T *proj_xy, const Vec3<T> &point, const Mat3<T> &rot_angle, const Vec3<T> &camera, const Vec3<T> &plane_to_camera)
{
Vec3<T> d=camera_angle*(point-camera);
Vec3<T> d=rot_angle*point-camera;
T scale = plane_to_camera[2]/d[2];
for(int i=0; i<2; ++i) proj_xy[i]= scale*d[i] + plane_to_camera[i];
}
@@ -858,7 +858,7 @@ template class Vec3<T>; \
template class Mat3<T>; \
template void euler2rotmat(const T *eul, Mat3<T> &a, const char *type, bool transpose=0, bool direction=0, bool reverse=0); \
template void rotmat2euler(T *eul, const Mat3<T> &a, const char *type, bool transpose=0, bool direction=0, bool reverse=0); \
template void perspective(T *proj_xy, const Vec3<T> &point, const Mat3<T> &camera_angle, const Vec3<T> &camera, const Vec3<T> &plane_to_camera); \
template void perspective(T *proj_xy, const Vec3<T> &point, const Mat3<T> &rot_angle, const Vec3<T> &camera, const Vec3<T> &plane_to_camera); \
#ifndef AVOID_STDSTREAM