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Medo Mex

How do I limit raycasting?

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Lets say that I have a ray starting from point A to point B as well as a LIMITED distance.
 
How do I make sure that the ray is always limited to the distance?
D3DXVECTOR3 vRayFrom(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 vRayTo(0.0f, 1000.0f, 5000.0f);
float limitedDistance = 50.0f; // The distance is only limited to 50.0f so the actual ray should be much shorter
Raycasting(vRayFrom, vRayTo, limitedDistance);

 

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auto rayDir  = vRayTo - vRayFrom;
D3DXVec3Normalize(&rayDir, &rayDir);
auto vRayEnd = vRayFrom + rayDir * limitedDistance;

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