From ba4feb7629b4e1e2fbeca1a154767352d0e34292 Mon Sep 17 00:00:00 2001
From: apl <apl@opencascade.com>
Date: Tue, 14 Oct 2014 15:47:34 +0400
Subject: [PATCH] 0025265: Perspective projection - selecting front point of
 two

---
 src/Select3D/Select3D_Projector.cxx |  4 +-
 tests/bugs/vis/bug25265             | 74 +++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+), 2 deletions(-)
 create mode 100644 tests/bugs/vis/bug25265

diff --git a/src/Select3D/Select3D_Projector.cxx b/src/Select3D/Select3D_Projector.cxx
index 6b7eb651fa..50cc4a9028 100644
--- a/src/Select3D/Select3D_Projector.cxx
+++ b/src/Select3D/Select3D_Projector.cxx
@@ -454,10 +454,10 @@ gp_Lin Select3D_Projector::Shoot (const Standard_Real theX, const Standard_Real
       return gp_Lin();
     }
 
-    Graphic3d_Vec4d aVPnt1 = aProjInv * Graphic3d_Vec4d (theX, theY, 0.0, 1.0);
+    Graphic3d_Vec4d aVPnt1 = aProjInv * Graphic3d_Vec4d (theX, theY,  0.0, 1.0);
     Graphic3d_Vec4d aVPnt2 = aProjInv * Graphic3d_Vec4d (theX, theY, 10.0, 1.0);
     aVPnt1 /= aVPnt1.w();
-    aVPnt2 /= aVPnt1.w();
+    aVPnt2 /= aVPnt2.w();
 
     gp_Vec aViewDir (aVPnt2.x() - aVPnt1.x(), aVPnt2.y() - aVPnt1.y(), aVPnt2.z() - aVPnt1.z());
 
diff --git a/tests/bugs/vis/bug25265 b/tests/bugs/vis/bug25265
new file mode 100644
index 0000000000..b93dd3413a
--- /dev/null
+++ b/tests/bugs/vis/bug25265
@@ -0,0 +1,74 @@
+puts "============"
+puts "OCC25265"
+puts "============"
+puts ""
+####################################################################################
+# Perspective projection - selecting front point of two.
+# When trying to select front point of two (lying on Z-coordinate) in a perspective
+# view, the back one is snapped and selected.
+####################################################################################
+
+set select_x 204
+set select_y 204
+
+vinit View1
+vsetdispmode 1
+vcamera -persp
+
+# Draw grid of points 7x7.
+set j 0
+for {set x 0} {$x<7} {incr x} {
+  for {set y 0} {$y<7} {incr y} {
+    vpoint $j $x $y 10
+    incr j
+  }
+}
+  for {set x 0} {$x<7} {incr x} {
+  for {set y 0} {$y<7} {incr y} {
+    vpoint $j $x $y 0
+    incr j
+  }
+}
+
+# Prepare view.
+vtop
+vfit
+
+vselect $select_x $select_y
+
+set stat 0
+set result [vstate]
+set newlist {}
+set ref_selected {24}
+set asplit [split $result "\n"]
+for {set i 0} {$i < [llength $ref_selected]} {incr i} {
+  lappend newlist [lindex [lindex $asplit $i] 0]
+}
+set newsorted [lsort $newlist]
+set refsorted [lsort $ref_selected]
+for {set i 0} {$i < [llength $refsorted]} {incr i} {
+  if {[lindex $refsorted $i] != [lindex $newsorted $i]} {
+    set stat 1
+    break
+  }
+}
+
+if {$stat == 1} {
+    puts "Error : Perspective selection is broken."
+}
+
+# Dump view.
+set scale 48.20
+set up_x  -0.09
+set up_y   0.94
+set up_z  -0.33
+set at_x   3.03
+set at_y   2.70
+set at_z   5.10
+set eye_x 16.40
+set eye_y 10.98
+set eye_z 24.59
+
+vviewparams -scale $scale -up $up_x $up_y $up_z -at $at_x $at_y $at_z -eye $eye_x $eye_y $eye_z
+
+set only_screen 1
\ No newline at end of file