Fix setNearFarDist for off-center projections

Engine/source/math/util/frustum.cpp

@@ -214,8 +214,26 @@ void Frustum::setNearFarDist( F32 nearDist, F32 farDist )
       return;
 
    // Recalculate the frustum.
-   MatrixF xfm( mTransform ); 
-   set( mIsOrtho, getFov(), getAspectRatio(), nearDist, farDist, xfm );
+   MatrixF xfm( mTransform );
+
+   const F32 CENTER_EPSILON = 0.01;
+   F32 centerX = mNearLeft + (mNearRight - mNearLeft) * 0.5;
+   F32 centerY = mNearBottom + (mNearTop - mNearBottom) * 0.5;
+   if ((centerX > CENTER_EPSILON || centerX < -CENTER_EPSILON) || (centerY > CENTER_EPSILON || centerY < -CENTER_EPSILON) )
+   {
+      // Off-center projection, so re-calc use the new distances
+      FovPort expectedFovPort;
+      expectedFovPort.leftTan = -(mNearLeft / mNearDist);
+      expectedFovPort.rightTan = (mNearRight / mNearDist);
+      expectedFovPort.upTan = (mNearTop / mNearDist);
+      expectedFovPort.downTan = -(mNearBottom / mNearDist);
+      MathUtils::makeFovPortFrustum(this, mIsOrtho, nearDist, farDist, expectedFovPort);
+   }
+   else
+   {
+      // Projection is not off-center, use the normal code
+      set(mIsOrtho, getFov(), getAspectRatio(), nearDist, farDist, xfm);
+   }
 }
 
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