[Bf-blender-cvs] [23bd6cff814] master: GPencil: Avoid LineArt modifier uses negative material index

[Antonio Vazquez]

Commit: 23bd6cff81464994b635e9daf33d57ec32055a31
Author: Antonio Vazquez
Date:   Wed Mar 31 16:17:31 2021 +0200
Branches: master
https://developer.blender.org/rB23bd6cff81464994b635e9daf33d57ec32055a31

GPencil: Avoid LineArt modifier uses negative material index

In some situations the material index could be negative, and this is wrong.

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M	source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c

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diff --git a/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c b/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
index 7fb3981d9dc..2389e0c403c 100644
--- a/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
+++ b/source/blender/gpencil_modifiers/intern/lineart/lineart_cpu.c
@@ -3858,7 +3858,7 @@ static void lineart_gpencil_generate(LineartRenderBuffer *rb,
 
     BKE_gpencil_stroke_add_points(gps, stroke_data, count, mat);
     BKE_gpencil_dvert_ensure(gps);
-    gps->mat_nr = material_nr;
+    gps->mat_nr = max_ii(material_nr, 0);
 
     MEM_freeN(stroke_data);