[Bf-blender-cvs] [19bb30baf60] master: Fix T102735: Knife tool does not work properly in perspective viewport

[Germano Cavalcante]

Commit: 19bb30baf6057d39a45f1e8693c6abcaceca84db
Author: Germano Cavalcante
Date:   Wed Nov 23 23:14:56 2022 -0300
Branches: master
https://developer.blender.org/rB19bb30baf6057d39a45f1e8693c6abcaceca84db

Fix T102735: Knife tool does not work properly in perspective viewport

Use `ED_view3d_win_to_3d` to unproject the first click coords.

This is the same function used in other tools like Draw Curve.

Differential revision: https://developer.blender.org/D16617

===================================================================

M	source/blender/editors/mesh/editmesh_knife.c

===================================================================

diff --git a/source/blender/editors/mesh/editmesh_knife.c b/source/blender/editors/mesh/editmesh_knife.c
index 369162e80a3..dbe77805dd8 100644
--- a/source/blender/editors/mesh/editmesh_knife.c
+++ b/source/blender/editors/mesh/editmesh_knife.c
@@ -1897,17 +1897,9 @@ static void knife_start_cut(KnifeTool_OpData *kcd)
   kcd->mdata.is_stored = false;
 
   if (kcd->prev.vert == NULL && kcd->prev.edge == NULL) {
-    float origin[3], origin_ofs[3];
     float ofs_local[3];
-
     negate_v3_v3(ofs_local, kcd->vc.rv3d->ofs);
-
-    knife_input_ray_segment(kcd, kcd->curr.mval, 1.0f, origin, origin_ofs);
-
-    if (!isect_line_plane_v3(
-            kcd->prev.cage, origin, origin_ofs, ofs_local, kcd->vc.rv3d->viewinv[2])) {
-      zero_v3(kcd->prev.cage);
-    }
+    ED_view3d_win_to_3d(kcd->vc.v3d, kcd->region, ofs_local, kcd->curr.mval, kcd->prev.cage);
 
     copy_v3_v3(kcd->prev.co, kcd->prev.cage); /* TODO: do we need this? */
     copy_v3_v3(kcd->curr.cage, kcd->prev.cage);