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Fix #120843: Brush texture not mirrored in vertex paint mode

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While using texture on the brush in vertex paint mode (neither generated
or imported texture), the brush texture is sampled based off of the
unmirrored coordinate.

To resolve, use the same method that sculptmode uses in
`sculpt_apply_texture` (flipping the coordinate over the mirror axis).

Pull Request: https://projects.blender.org/blender/blender/pulls/120935
This commit is contained in:
Philipp Oeser
2024-04-26 07:49:36 +02:00
committed by Philipp Oeser
parent b7772cfa8b
commit b47242314f
1 changed files with 13 additions and 2 deletions
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15
source/blender/editors/sculpt_paint/paint_vertex.cc
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@@ -1699,8 +1699,19 @@ static void vpaint_do_draw(bContext *C,
float tex_alpha = 1.0;
if (vpd->is_texbrush) {
/* NOTE: we may want to paint alpha as vertex color alpha. */
tex_alpha = paint_and_tex_color_alpha<Color>(
vp, vpd, vpd->vertexcosnos[v_index].co, &color_final);
/* If the active area is being applied for symmetry, flip it
* across the symmetry axis and rotate it back to the original
* position in order to project it. This insures that the
* brush texture will be oriented correctly.
* This is the method also used in #sculpt_apply_texture(). */
float symm_point[3];
if (cache->radial_symmetry_pass) {
mul_m4_v3(cache->symm_rot_mat_inv.ptr(), vpd->vertexcosnos[v_index].co);
}
flip_v3_v3(symm_point, vpd->vertexcosnos[v_index].co, cache->mirror_symmetry_pass);
tex_alpha = paint_and_tex_color_alpha<Color>(vp, vpd, symm_point, &color_final);
}
Color color_orig(0, 0, 0, 0);