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Thread: Resolution problems on a large relief carving

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    Join Date
    Oct 2009
    Elgin Illinois

    Default Resolution problems on a large relief carving

    Hello Shopbot Friends:

    There is a question at the end of this post, but I can not ask it without providing lots of details first....Sorry. Any suggestions will be greatly appreciated, as I feel stuck. Thank you, Chuck

    About 18 months ago, I used Aspire to make a 3D relief model of the image shown in the first attachment. At that time, I made a huge beginner’s mistake. I made the “Job Size” twice as large as the actual size of the model, and I ended up with really jagged/pixelated edges on my 3D model. I posted what I had done here and on another forum. I was told that my model was fundamentally flawed, and that to get better results, I would need to start all over, and keep my “Job size” as small as possible in addition to using higher modeling resolution. So I spent well over a week to make an entirely new model.

    My plan was to model one part of the design, with the "Job Size" just slightly larger than the actual part. Then I would add a few more elements into the design, and enlarge the "Job Size" just enough to contain the previously made parts plus the new part. Along the way, I would go and make a side byside comparison of the resolution of my new model, compared to the one I made originally in 2016. (See attachment.) My resolution was much better, so stupidly I kept plowing ahead, always keeping the "Job Size" just big enough.

    By the time I had gotten the model up to the central part of the design (the base, the "trumpet" and the artichoke, plus everything on the right side, the "Job Size" was upto 31" x 32", and the model resolution was set for Very High, 4million points.

    Finally, I made the "Job Size" 68" x 34" and increased the resolution to "Extremely High", 8million points. Then I reflected everything from the right side onto the left side to get the complete model.

    I had to keep the entire model active to allow modifications of any part, so that I could view the entire design all at one time, and adjust anything so that each part would be correct relative to all the other parts in the composition. Even though each segment of the design looked OK by itself, I had to go and do lots of fine adjustments all around the design to make it look good. I viewed the composition from many angles, making lots of small adjustments. But I thought I was all done until...............

    I ran a couple of cut simulations, and realized that I had pixilation along the edges of my model. Then I thought, well, I'll add some draft to the model and do a profile cut to clean up the edges............. I then compared a cut simulation of my final artichoke from the entire completed design, with the same artichoke that I had originally modeled in a 3" x 5" Job Size, and my heart sank. That is when I realized that I had pixilation all across my model, not just along the edges...............

    I took a copy of the pixilated artichoke from the big/pixilated model and tried to clean that up using Aspire's sculpting tools. While I was able to make some improvement, what I got was still crummy compared to my original hi resolution artichoke made in a small "Job Size".

    I want my model be of a high enough quality so that if I choose to mount this (or a similar future design) at eye level, that it won't require tons of hand clean up. In cases where the end relief carving will be mounted 10 feet up in the air, I can use a larger bit, bigger step-overs etc.) But even then I want my model to be high quality, and right now, I don't seem to know how to make a high resolution BIG relief model.

    I posted my problem on another forum last week asking how best to fix this situation to my satisfaction. But that discussion seems to have played out, without my getting much direction. Though someone directed meto: This has given me added insight, but still not a clear cut path.

    1) What should I have done to improve my modeling resolution and provide the lowest possible amount of pixelation on my complete model?

    2) Or is my objective not technically feasible?

    Thank you for your time and consideration,Chuck

    PS: Someone on the other forum said that the level of detail that I want can not be reproduced with a practical bit size. But Aspire cut simulations showed a big difference in cutting my original high resolution artichoke compared to the pixilated version taken from my full sized model.
    Attached Images Attached Images
    Last edited by Chuck Keysor; 05-04-2018 at 02:00 AM. Reason: Add a space between two words
    Chuck Keysor (circa 1956)
    PRT Alpha 60" x 144" (circa 2004)
    Columbo 5HP spindle
    Aspire 9.0, Rhino 5

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