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Problem with getting Mouseposition

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well, i've got a scene with several objects and want to find out at which position the Cursor of the mouse is, i'm doing this with glUnProject(). so far it works fine. when i add blending to a few objects i have to (as read in the redbook) draw them last and with depth buffer read-only (to be sure that depth-test works) now glUnProject() does not get the correct position of the mouse in the scene anymore when the cursor is over a blended object i think i know why that occurs (i will not explain here why, because my english is too bad for that :P ), but i dont know how to solve it... any suggestions? sorry for my bad english if there are problems with understanding my text, feel free to ask

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