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extracting view frustum corners

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Recep Aslantas
2017-12-30 17:51:40 +03:00
parent 634e1170a3
commit 400fc6cbee
1 changed files with 42 additions and 5 deletions
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47
include/cglm/cam.h
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@@ -425,18 +425,17 @@ glm_persp_decomp_near(mat4 proj, float * __restrict nearVal) {
*nearVal = proj[3][2] / (proj[2][2] - 1);
}
/*!
* @brief extracts view frustum planes
*
* planes' space:
* 1- if m = proj: View Space
* 2- if m = projView: World Space
* 2- if m = viewProj: World Space
* 3- if m = MVP: Object Space
*
* You probably want to extract planes in world space so use projView as m
* Computing projView:
* glm_mat4_mul(proj, view, projView);
* You probably want to extract planes in world space so use viewProj as m
* Computing viewProj:
* glm_mat4_mul(proj, view, viewProj);
*
* Exracted planes order: [left, right, bottom, top, near, far]
*
@@ -465,4 +464,42 @@ glm_extract_planes(mat4 m, vec4 dest[6]) {
glm_plane_normalize(dest[5]);
}
/*!
* @brief extracts view frustum corners using clip-space coordinates
*
* corners' space:
* 1- if m = invViewProj: World Space
* 2- if m = invMVP: Object Space
*
* You probably want to extract corners in world space so use invViewProj
* Computing invViewProj:
* glm_mat4_mul(proj, view, viewProj);
* ...
* glm_mat4_inv(viewProj, invViewProj);
*
* @param[in] invMat matrix (see brief)
* @param[out] dest exracted view frustum corners (see brief)
*/
CGLM_INLINE
void
glm_frustum_corners(mat4 invMat, vec4 dest[8]) {
glm_mat4_mulv(invMat, (vec4){-1.0f, -1.0f, -1.0f, 1.0f}, dest[0]);
glm_mat4_mulv(invMat, (vec4){-1.0f, 1.0f, -1.0f, 1.0f}, dest[1]);
glm_mat4_mulv(invMat, (vec4){ 1.0f, -1.0f, -1.0f, 1.0f}, dest[2]);
glm_mat4_mulv(invMat, (vec4){ 1.0f, 1.0f, -1.0f, 1.0f}, dest[3]);
glm_mat4_mulv(invMat, (vec4){-1.0f, -1.0f, 1.0f, 1.0f}, dest[4]);
glm_mat4_mulv(invMat, (vec4){-1.0f, 1.0f, 1.0f, 1.0f}, dest[5]);
glm_mat4_mulv(invMat, (vec4){ 1.0f, -1.0f, 1.0f, 1.0f}, dest[6]);
glm_mat4_mulv(invMat, (vec4){ 1.0f, 1.0f, 1.0f, 1.0f}, dest[7]);
glm_vec4_scale(dest[0], 1.0f / dest[0][3], dest[0]);
glm_vec4_scale(dest[1], 1.0f / dest[1][3], dest[1]);
glm_vec4_scale(dest[2], 1.0f / dest[2][3], dest[2]);
glm_vec4_scale(dest[3], 1.0f / dest[3][3], dest[3]);
glm_vec4_scale(dest[4], 1.0f / dest[4][3], dest[4]);
glm_vec4_scale(dest[5], 1.0f / dest[5][3], dest[5]);
glm_vec4_scale(dest[6], 1.0f / dest[6][3], dest[6]);
glm_vec4_scale(dest[7], 1.0f / dest[7][3], dest[7]);
}
#endif /* cglm_vcam_h */