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How do I calculate the object-space distance from the viewer to a given point?

April 26, 2017CALCULATE distance given object-space point transformations viewer viewing

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How do I calculate the object-space distance from the viewer to a given point?

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Transform the point into eye-coordinate space by multiplying it by the ModelView matrix. Then simply calculate its distance from the origin. (If this doesn’t work, you may have incorrectly placed the view transform on the Projection matrix stack.