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Thread: Drawing circles in the same 3D plane

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    Default Drawing circles in the same 3D plane

    AC2004
    How do you draw a circle with reference to another object? I have a wheel rim drawn in 3D complete with spokes radiating from the centre. I want to put a spoke hole on the end of each spoke where it penetrates the rim. So as the spokes radiate about the rim the circles on the end of each spoke will change in plane to be at 90deg to each spoke in turn. I'm stumped.
    Last edited by ukdodger; 2009-11-08 at 10:18 PM.

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    Certified AUGI Addict jaberwok's Avatar
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    Default Re: Drawing circles in the same 3D plane

    Assuming the spokes do not lie in a single plane -
    If the spokes already pass through the rim just copy all the spokes in place (so each spoke is actually 2 spokes) then subtract one of each spoke from the rim. You can offset face later to enlarge the holes.
    If the spokes do all lie in the same plane (in a polar array) copy one spoke (changing its colour will help later) and array it to match the other spokes then subtract from the rim.
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

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    Default Re: Drawing circles in the same 3D plane

    Quote Originally Posted by jaberwok View Post
    Assuming the spokes do not lie in a single plane -
    If the spokes already pass through the rim just copy all the spokes in place (so each spoke is actually 2 spokes) then subtract one of each spoke from the rim. You can offset face later to enlarge the holes.
    If the spokes do all lie in the same plane (in a polar array) copy one spoke (changing its colour will help later) and array it to match the other spokes then subtract from the rim.
    Thanks JB but I'm at a loss to see how that creates any holes? I've drawn lines from the centre of the wheel hub radiating around the wheel, I used the hub centre so that they would pass through the rim centre. Like the spokes of a wagon wheel. Later I will relocate them from the hub centre to the hub edge. What I need are holes where they pass through the rim centre. Each hole will be at right angles to the spoke and tangent to the rim. Am I missing something here? I'm using the wireframe display.

    RD

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    Default Re: Drawing circles in the same 3D plane

    I was assuming that you're still working on a bicycle and that you're making 3d solids.
    Was I wrong?
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

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    Default Re: Drawing circles in the same 3D plane

    Quote Originally Posted by jaberwok View Post
    I was assuming that you're still working on a bicycle and that you're making 3d solids.
    Was I wrong?
    Nope. It is a bicycle wheel but not in solids. I've never used solids. If this works I'll try doing the same thing in solids.

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    Default Re: Drawing circles in the same 3D plane

    Quote Originally Posted by ukdodger View Post
    Nope. It is a bicycle wheel but not in solids. I've never used solids. If this works I'll try doing the same thing in solids.
    So, meshes then?
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

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    Default Re: Drawing circles in the same 3D plane

    Quote Originally Posted by jaberwok View Post
    So, meshes then?
    No wireframe. I think that's what it's called. Just lines.

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    Default Re: Drawing circles in the same 3D plane

    If it's just lines, it can't possibly have holes.
    How about posting an example of what you're doing?
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

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    Default Re: Drawing circles in the same 3D plane

    Quote Originally Posted by jaberwok View Post
    If it's just lines, it can't possibly have holes.
    How about posting an example of what you're doing?
    Well not holes then but circles. Attached drawing.
    Attached Files Attached Files

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    Default Re: Drawing circles in the same 3D plane

    Is the blue circle what you want?
    Attached Files Attached Files
    John B

    "You can't convince a believer of anything; for their belief is not based on evidence, it's based on a deep-seated need to believe." - Carl Sagan

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