3d-vertex to 2d-screencoordinates
Author
i need to convert a 3d-vertex to 2d-screencoordinates.
how can i do that ?
i thought about doing a special calculation with the vertex and
the two matrices (projection and modelview).
ScreenX = X/Z
ScreenY = Y/Z
ScreenZ = Z/Z = 1
giving you the (x,y) co-ords. That''s the way I know someone will probably know a better way :p
ScreenY = Y/Z
ScreenZ = Z/Z = 1
giving you the (x,y) co-ords. That''s the way I know someone will probably know a better way :p
You can use gluProject and gluUnProject to convert back and forth. If you''re trying to draw a 2D object you can use an orthographic projection matrix.
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Author
yeah, thats the function i needed !! thx
but if someone has the real mathematical calculation for this,
please tell me !!
but if someone has the real mathematical calculation for this,
please tell me !!
I''m not sure of the exact mathematical calculation, but I know the vertex goes through the modelview and projection matrices in order to be displayed on a 2D screen
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