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Thread: making cut faces visible

  1. #1
    Junior Member Newbie hoschie211's Avatar
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    Oct 2009
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    making cut faces visible

    hello everyone,

    my task is it to render the cut faces of the intersection of two objects.

    the first object is a given, rather complex cad model and from this model i want to cut out a cuboid.

    i have accomplished to cut out everything from the model, that lies in the cuboid, with a simple fragment-shader. but now i am looking at the backside of the cad model. (if the cuboid is not completely in the model).

    so is there a way to draw the cut faces? (without geometry shaders)

    I am thankful for any kind of help.


  2. #2
    Senior Member Frequent Contributor
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    Feb 2006
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    Sweden
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    Re: making cut faces visible

    yea, the traditional way is to use the stencil buffer.
    when you render your object you make sure that frontfaces set the stencil to 0 and back faces set it to 1.
    Once that is completed you will have a stencil cutout in witch you then render the inside of the cuboid with the faces reversed, that would be your cut faces, add a little "cut metal painted red" texture to it and your good to go.

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