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Thread: Glass problems...

  1. #1
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    Question Glass problems...

    I followed William's tutorial (here: http://www.newtek.com/forums/showthread.php?t=78198) to the letter, but I just can't seem to get a good glass effect. Here's what I came up with after following his lead....

    *big image alert*
    http://img131.imageshack.us/img131/8867/picture2fm6.png

    This doesn't look much like glass at all. I do have all the important ray trace options enabled.

    I've also tried playing around with Absorption and RI - without much luck. What could I be missing?

    Any suggestions?

    Thanks,
    MS
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

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  2. #2
    Pixel and Poly Pusher JeffrySG's Avatar
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    You have reflection and refraction enabled? just checking...

  3. #3
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    Yep

    Correct. Both are enabled.
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

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  4. #4
    Old Dog Learns New Tricks RudySchneider's Avatar
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    Don't forget that there are separate Render Global as well as Camera Properties. If you're simply changing the Global Properties, but haven't checked "Use Global" in the Camera Properties dialog box, you'll be disappointed.
    There are no problems, only opportunities...

  5. #5
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    Sadly, that didn't help it. Although I don't know why.
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

    Macs FTW:yoda:

  6. #6
    3D & FX Animations DAMAKERS's Avatar
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    have u turn on the nodes in the surface pannel?

    also could u put something to be refletcted so can see the glass behavior.

    maybe u know all this, but trying to help
    Last edited by DAMAKERS; 04-25-2008 at 11:13 AM.

  7. #7
    Pixel and Poly Pusher JeffrySG's Avatar
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    The easiest thing is to probably zip up your model and scene and post it here so we can take a look....

  8. #8
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    Files

    Alright. Here are my files, LWS and LWO.

    Messing with Absorption has some weird effects. If I set it to 1.0 or higher, the glass is invisible.

    Also, the "glass" material is named "Cup" in my scene.

    This was done on an Intel Macbook Pro with LW 9.3.1 Mac32.

    Thanks for any suggestions, guys. I do appreciate it.

    MS
    Attached Files Attached Files
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

    Macs FTW:yoda:

  9. #9
    Old Dog Learns New Tricks RudySchneider's Avatar
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    You've got a couple things going on here, MSwengel...

    1. Your object is HUGE! When you model, try to scale your objects to real-world dimensions. The primary reason for this is that the lighting and camera in Layout are based on real-world optics.
    2. Your glass is quite thick. Hence, it will naturally absorb more light.
    3. Try not to use 100% diffuse settings for your materials. something on the order of 60-to-70% is more realistic. Learn to rely more on your lighting (which I also bumped up to 100% for BOTH lights) to set the mood..

    I did a quick reduce of your model to 9% of what was, repositioned the camera, and here's a simple render:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by RudySchneider; 04-25-2008 at 09:18 PM.
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  10. #10
    Old Dog Learns New Tricks RudySchneider's Avatar
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    BTW, I set the absorbtion to 20 (percent), and th refractive index to 1.5.
    There are no problems, only opportunities...

  11. #11
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    Ahhhh! Now that makes sense. It was absorbing too much light because of its size - in layman's terms. Thanks!
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

    Macs FTW:yoda:

  12. #12
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    Quote Originally Posted by RudySchneider View Post
    BTW, I set the absorbtion to 20 (percent), and th refractive index to 1.5.
    Could you post your scene file? I resized the object (in Layout) and readjusted the camera and values - without much luck.

    I've attached the altered file. It's "resized.lws."
    Attached Files Attached Files
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

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  13. #13
    Old Dog Learns New Tricks RudySchneider's Avatar
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    I didn't resize the objects is Layout. I resized them in Modeler, where it's supposed to be re-sized. I didn't save the Layout file, but here's the Object file. BTW, I also centered everything, and placed your backdrop on the X-Z plane, just out of habit.
    Attached Files Attached Files
    There are no problems, only opportunities...

  14. #14
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    Aha! I see! Thank you, RudySchneider!

    Note to self: resize in Modeler...

    Thanks again,
    MS
    Faith is not the opposite of intelligence. The lack of faith is the lack of intelligence, for it is impossible to know everything.:thumbsup:

    Macs FTW:yoda:

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