Fix typo

Shaders/HDR/atmos_aerial_perspective.frag

@@ -23,6 +23,7 @@ uniform vec3 fg_SunDirectionWorld;
 
 const float AP_SLICE_COUNT = 32.0;
 const float AP_MAX_DEPTH = 128000.0;
+
 const int AERIAL_PERSPECTIVE_STEPS = 20;
 
 // pos_from_depth.glsl

Shaders/HDR/model_pbr_transparent.frag

@@ -54,5 +54,5 @@ void main()
         base_color.rgb, metallic, roughness, occlusion,
         vP, N, V, uv, ap_color, osg_ViewMatrixInverse);
 
-    fragColor = vec4(color, baseColor.a);
+    fragColor = vec4(color, base_color.a);
 }