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Question by ina · Feb 14, 2012 at 07:28 AM · cameratransformcubefrustrum

Setting a cube to be exactly size of intersecting camera view plane

Suppose a camera always follows a cube - how do you set the cube to be exactly the size of the camera's viewing pane at a distance away?

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Answer by senad · Feb 14, 2012 at 08:58 AM

You can set up a plane orthogonal to the camera viewing direction in the same distance as the cube. Then you can make ray casts through the four corners of your view plane to find the corresponding four points in world space.

Then you can use those four points to adapt your cube geometry. The details depend on which parts of the cube you want to align with the view plane.

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avatar image ina · Feb 14, 2012 at 09:12 PM 0
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Would you need another plane as a huge collider to make the raycasts?

avatar image senad · Feb 15, 2012 at 09:12 AM 0
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Yes, you need the rays to intersect with something.

avatar image fherbst · Feb 15, 2012 at 09:25 AM 1
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But you do not need a mesh plane. See the documentation on Plane [http://unity3d.com/support/documentation/ScriptReference/Plane.html], which can do Raycasts by itself and is infinitely sized.

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