howto place a 3d object in the lower right corner of the viewport

@bettina4you wrote:

hello,

i have a 3d manipulator object that i use to manipulate translation, rotation, scale of other 3d objects.

I want to place it at a fix position and fix size on my viewport independent from my current view matrix, view projection matrix. Also other object shall not be able to overdraw this object it shall allways be visible.

I suppose i will somehow need the inverse view and projection matrix of my camera but how is this done exactly ?

Many thanks for every hint

Greetings from betty in Germany

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