Hi,

I have to build a sphere in a 3D scatter plot which is based on a sphere defined by the x, y and z positions (ie: center) and a radius of for exemple 40 pixels.

I have the formula to build a sphere based on a center point and a radius but my problem is that the sphere radius is in pixel and I and need a radius values for each axes (x, y, z).

So my question: how can I kow the x, y and z radius values based on the radiusof the sphere in pixel (that I know)?

Is there a way to retrieve cameras parameters to transform x pixel in values for each axes for exemple?

Thanks a lot for your help and sory for my english

Pascal.