Thread: tank track vertex shader

  1. #1
    Registered User
    Join Date
    Oct 2003

    tank track vertex shader

    hey all,

    Has anyone had any success procedurally animating tank tracks with a vertex shader?

    The animator i'm working with is another hobbyist - he dosn't normally do much animation (more involved in modelling/skinning) and he tells me that tank tracks are not the easiest thing to animate in 3d design packages. I want to help him out if I can.

    I thought maybe i could try to use an equation for an ellipse and try to doctor it somehow to make it a bit more boxy, but i can't really see how to make it a 'boxy' ellipse without the shader really slowing down.

  2. #2
    Super Moderator VirtualAce's Avatar
    Join Date
    Aug 2001
    Use a stencil buffer. You can overlay images on top of the ground texture. However stencil buffers are very expensive and if the z depth is not done correctly your tank tracks will flicker on and off with the ground texture.

  3. #3
    Join Date
    Jan 2003
    i wouldn't use stencil buffer for this unless there was no better method. you can do texture animations so that it looks like the treads are moving when the tank is moving.

  4. #4
    Registered User
    Join Date
    Apr 2002
    Why not just use decals? That seems like it'd work pretty good. Whenever you draw the decals just turn off depth testing so it'll always render over the ground.
    "...the results are undefined, and we all know what "undefined" means: it means it works during development, it works during testing, and it blows up in your most important customers' faces." --Scott Meyers

  5. #5
    Registered User
    Join Date
    Oct 2003
    Thanks guys. I'll give all 3 a go and maybe come back with demos for them (assuming i can get them working properly). People can compare and contrast then.

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