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Fix setNearFarDist for off-center projections

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This commit is contained in:
James Urquhart 2016-05-20 16:15:56 +01:00
parent 694dd4abfa
commit 14628e3937
1 changed files with 20 additions and 2 deletions
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22
Engine/source/math/util/frustum.cpp
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@ -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);
}
}
//-----------------------------------------------------------------------------