Applied proper fix from jaMME for lines disappearing at certain angles (

#214)

See entdark/jaMME@4dcef10

(cherry picked from commit 41af0cd)

Co-authored-by: Ensiform <ensiform@gmail.com>

codemp/client/FxPrimitives.cpp

@@ -750,6 +750,30 @@ CLine::CLine(void)
  mRefEnt.reType = RT_LINE;
 }
 
+//----------------------------
+bool CLine::Cull( void )
+{
+ vec3_t dir;
+
+ VectorSubtract( mOrigin1, theFxHelper.refdef->vieworg, dir );
+
+ //Check if it's in front of the viewer
+ if ( (DotProduct( theFxHelper.refdef->viewaxis[0], dir )) >= 0 )
+ {
+ return false; //don't cull
+ }
+
+ VectorSubtract( mOrigin2, theFxHelper.refdef->vieworg, dir );
+
+ //Check if it's in front of the viewer
+ if ( (DotProduct( theFxHelper.refdef->viewaxis[0], dir )) >= 0 )
+ {
+ return false;
+ }
+
+ return true; //all points behind viewer
+}
+
 //----------------------------
 void CLine::Draw(void)
 {

codemp/client/FxPrimitives.h

@@ -401,6 +401,7 @@ class CLine : public CParticle
  virtual void Die() {}
 
  virtual bool Update();
+ virtual bool Cull();
 
  inline void SetOrigin2( vec3_t org2 ) { VectorCopy( org2, mOrigin2 ); }
 };