From c81bfb09b73605b04dc65ee9c1f09d856177026b Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Mon, 30 Mar 2020 14:01:50 +0200
Subject: [PATCH] shader: default fog exponential density to 0 if fog is
 disabled

---
 panda/src/display/graphicsStateGuardian.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/panda/src/display/graphicsStateGuardian.cxx b/panda/src/display/graphicsStateGuardian.cxx
index d381706835..a7f2c41685 100644
--- a/panda/src/display/graphicsStateGuardian.cxx
+++ b/panda/src/display/graphicsStateGuardian.cxx
@@ -1017,7 +1017,8 @@ fetch_specified_part(Shader::ShaderMatInput part, InternalName *name,
       _target_rs->get_attrib_def(FogAttrib::get_class_slot());
     Fog *fog = target_fog->get_fog();
     if (fog == nullptr) {
-      return &LMatrix4::ones_mat();
+      t.set(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1);
+      return &t;
     }
     PN_stdfloat start, end;
     fog->get_linear_range(start, end);