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DRW: Increase frustum culling precision 

Use normal_quad_v3 instead of normal_tri_v3 and compute the mean of all
corner distance during frustum plane extraction.

Fix T58243 Flickering of viewport when rotating and zooming
This commit is contained in:
Clément Foucault 2019-01-18 10:22:11 +01:00
parent a7b8538f4c
commit d5b4d71ee7
Notes: blender-bot 2023-02-14 04:53:11 +01:00 
Referenced by issue #58243, Flickering of viewport when rotating and zooming
1 changed files with 14 additions and 9 deletions
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23
source/blender/draw/intern/draw_manager_exec.c
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@ -532,21 +532,26 @@ static void draw_clipping_setup_from_view(void)
/* Compute clip planes using the world space frustum corners. */
for (int p = 0; p < 6; p++) {
int q, r;
int q, r, s;
switch (p) {
case 0: q = 1; r = 2; break; /* -X */
case 1: q = 0; r = 5; break; /* -Y */
case 2: q = 1; r = 5; break; /* +Z (far) */
case 3: q = 2; r = 6; break; /* +Y */
case 4: q = 0; r = 3; break; /* -Z (near) */
default: q = 4; r = 7; break; /* +X */
case 0: q = 1; r = 2; s = 3; break; /* -X */
case 1: q = 0; r = 4; s = 5; break; /* -Y */
case 2: q = 1; r = 5; s = 6; break; /* +Z (far) */
case 3: q = 2; r = 6; s = 7; break; /* +Y */
case 4: q = 0; r = 3; s = 7; break; /* -Z (near) */
default: q = 4; r = 7; s = 6; break; /* +X */
}
if (DST.frontface == GL_CW) {
SWAP(int, q, r);
}
normal_tri_v3(DST.clipping.frustum_planes[p], bbox.vec[p], bbox.vec[q], bbox.vec[r]);
DST.clipping.frustum_planes[p][3] = -dot_v3v3(DST.clipping.frustum_planes[p], bbox.vec[p]);
normal_quad_v3(DST.clipping.frustum_planes[p], bbox.vec[p], bbox.vec[q], bbox.vec[r], bbox.vec[s]);
/* Increase precision and use the mean of all 4 corners. */
DST.clipping.frustum_planes[p][3] = -dot_v3v3(DST.clipping.frustum_planes[p], bbox.vec[p]);
DST.clipping.frustum_planes[p][3] += -dot_v3v3(DST.clipping.frustum_planes[p], bbox.vec[q]);
DST.clipping.frustum_planes[p][3] += -dot_v3v3(DST.clipping.frustum_planes[p], bbox.vec[r]);
DST.clipping.frustum_planes[p][3] += -dot_v3v3(DST.clipping.frustum_planes[p], bbox.vec[s]);
DST.clipping.frustum_planes[p][3] *= 0.25f;
}
/* Extract Bounding Sphere */