Retrieve screen coordinates from 3d view

(3 posts) (2 voices)

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rbrooky
Member

I have a problem I run into. I have a 2d game but I do have a some 3d effects with different layers at different zVertex.

[sprite setVertexZ:40];

Objects on this layer appear within the screen even if the position on their layer is 480 x 160 (in the far right side of the screen). Since the layer is further away from the viewer, they appear somewhat close to the center of the screen. Now I have a need to know the coordinates where the object appears relative to the screen. If it appears let's say 40 pixels left or the right side of the screen I need to know its coordinates of 440x160. Any idea how to achieve this?

Thanks!

Posted 2 years ago #
vitoralmeidasilva
Member

Actually I am facing the same problem: I have an inclined plane (a single sprite rotated -22 degrees around the X axis) where I want to convert his touch coordinates based on the finger on screen.

Unfortunetly its basic trigonometry which I am not that good (shame on me).

When I find a solution I post it here.

Posted 2 years ago #
vitoralmeidasilva
Member

Perhaps this post can help (not iphone related): the user is trying to convert the mouse 2d screen coordinates to 3d coordinates (mapping them to a 3d sphere).

http://www.gamedev.net/community/forums/topic.asp?topic_id=480322

I have not tested it yet.

Posted 2 years ago #

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