Fix neg-scaled project-paint in perspective mode
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@ -1403,6 +1403,9 @@ static float project_paint_uvpixel_mask(
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viewDirPersp[1] = (ps->viewPos[1] - (w[0] * co1[1] + w[1] * co2[1] + w[2] * co3[1]));
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viewDirPersp[2] = (ps->viewPos[2] - (w[0] * co1[2] + w[1] * co2[2] + w[2] * co3[2]));
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normalize_v3(viewDirPersp);
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if (UNLIKELY(ps->is_flip_object)) {
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negate_v3(viewDirPersp);
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}
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angle_cos = dot_v3v3(viewDirPersp, no);
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}
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@ -3384,6 +3387,9 @@ static void proj_paint_state_vert_flags_init(ProjPaintState *ps)
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else {
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sub_v3_v3v3(viewDirPersp, ps->viewPos, mv->co);
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normalize_v3(viewDirPersp);
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if (UNLIKELY(ps->is_flip_object)) {
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negate_v3(viewDirPersp);
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}
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if (dot_v3v3(viewDirPersp, no) <= ps->normal_angle__cos) { /* 1 vert of this face is towards us */
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ps->vertFlags[a] |= PROJ_VERT_CULL;
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}
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