Fix T93360: 'Iteractive Light Track' do not work over empty background

Bug introduced in {rBaa0ac0035a0d}.

The invalid depth fallback was changed to `FLT_MAX` in order to match the
annotation and gpencil operations.

This broke the `Interactive Light Track` operator which invalidates the
operation if the depth value is `1.0f`.

The chosen solution was to change the value tested in the annotation and
gpencil operations.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/gpencil/gpencil_fill.c b/source/blender/editors/gpencil/gpencil_fill.c
index 9860c75f290..90cf64b58d8 100644
--- a/source/blender/editors/gpencil/gpencil_fill.c
+++ b/source/blender/editors/gpencil/gpencil_fill.c
@@ -1415,7 +1415,7 @@ static void gpencil_get_depth_array(tGPDfill *tgpf)
     }
     else {
       if (interp_depth) {
-        interp_sparse_array(tgpf->depth_arr, totpoints, FLT_MAX);
+        interp_sparse_array(tgpf->depth_arr, totpoints, DEPTH_INVALID);
       }
     }
   }