Fix T48799: Particles set as objects cast wrong ray shadows in BI

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/render/intern/raytrace/rayobject_instance.cpp b/source/blender/render/intern/raytrace/rayobject_instance.cpp
index d080ddcc375..349f0fc6844 100644
--- a/source/blender/render/intern/raytrace/rayobject_instance.cpp
+++ b/source/blender/render/intern/raytrace/rayobject_instance.cpp
@@ -125,6 +125,9 @@ static int  RE_rayobject_instance_intersect(RayObject *o, Isect *isec)
 		isec->bv_index[2 * i + 1] = i + 3 * isec->bv_index[2 * i + 1];
 	}
 
+	// Pre-calculate orientation for watertight intersection checks.
+	isect_ray_tri_watertight_v3_precalc(&isec->isect_precalc, isec->dir);
+
 	// raycast
 	res = RE_rayobject_intersect(obj->target, isec);
 
@@ -168,6 +171,9 @@ static int  RE_rayobject_instance_intersect(RayObject *o, Isect *isec)
 		isec->bv_index[2 * i + 1] = i + 3 * isec->bv_index[2 * i + 1];
 	}
 
+	// Pre-calculate orientation for watertight intersection checks.
+	isect_ray_tri_watertight_v3_precalc(&isec->isect_precalc, isec->dir);
+
 	return res;
 }