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How do they do that....

whispers65whispers65 Posts: 952
edited December 1969 in The Commons

There are a couple of things I want to try in some renders but not sure how to go about it. Any advice would be greatly appreciated.

1) a room with a TV on and a picture on the screen. The only light would be coming from the TV. I guess the same principle would apply for a computer in a dark room, etc.

2) Looking out a peep hole. I'm thinking for my zombie novel, doing a pic where the guy looks out the peep hole and sees a zombie on the other side. I'm not sure how to get the distortion. I guess a webcam would be similar but I don't know about that either.

On a side note, I was doing some renders tonight and I would see a white line like a seam. It wasn't always and distance played a factor. For light I was only using Uber 2. Any ideas? I know UV plays a role in that but usually if it is the wrong one there will be way bad distortion even before the render. In this case everything looks fine until a render and then it depends on how far it is and so forth or seems so.

I'm tired. Sorry for the meandering here....

Comments

  • JaderailJaderail Posts: 0
    edited August 2013

    whispers65 said:
    There are a couple of things I want to try in some renders but not sure how to go about it. Any advice would be greatly appreciated.

    1) a room with a TV on and a picture on the screen. The only light would be coming from the TV. I guess the same principle would apply for a computer in a dark room, etc.

    2) Looking out a peep hole. I'm thinking for my zombie novel, doing a pic where the guy looks out the peep hole and sees a zombie on the other side. I'm not sure how to get the distortion. I guess a webcam would be similar but I don't know about that either.

    On a side note, I was doing some renders tonight and I would see a white line like a seam. It wasn't always and distance played a factor. For light I was only using Uber 2. Any ideas? I know UV plays a role in that but usually if it is the wrong one there will be way bad distortion even before the render. In this case everything looks fine until a render and then it depends on how far it is and so forth or seems so.

    I'm tired. Sorry for the meandering here....

    1. Use the Uber Area Base on the Screen of the TV, add the Image you like to the Diffuse Channel of the Screen set to 100% white and Again to the Ambient Channel of the Screen also set to 100% white and full strength. For the Uber Area Light setting RAMP the strength VERY high and ONLY touch the Falloff END and not the Falloff Start.

    2.That Is done with the Camera Settings, I do not have a Fish eye lens example to share, I hope another does.

    3. Most of the time that is a Render Settings Issue, set the Shading rate to .5 and see if the seams work now.
    Post edited by Jaderail on
  • SzarkSzark Posts: 10,634
    edited December 1969

    And not to forget my Area light tutorail Tutorial Uber Area Lighting: The Basics

  • icprncssicprncss Posts: 3,694
    edited December 1969

    Can DS turn an object or surface into a light emitter?

  • SzarkSzark Posts: 10,634
    edited December 1969

    Yes see my post above yours icprncss

  • ArkathanArkathan Posts: 65
    edited December 1969

    You can get a quick and dirty fish eye lens by turning down the focal length. Here I have it set to 10

    Fisheye.jpg
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  • whispers65whispers65 Posts: 952
    edited December 1969

    Hey thanks! Actually for what I want to do something like that will work fine.

    I may work on it some today. Yesterday I worked mainly on character creation, poses, and my Big Foot series. It always gets me laughing.

    Thanks for everyone's input! It is much appreciated.

    On another note, I've tried making a surface it's own light emitter before but didn't have good luck. I'll try again.

  • JaderailJaderail Posts: 0
    edited December 1969

    Just tossed this together in DS4.6 to show a Uber Area light at work. Only one light and its the Crystal Ball.

    Area-Light.jpg
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  • BlazeMystEraBlazeMystEra Posts: 464
    edited December 1969

    Very helpfull topic!
    Thank you :)

  • ArkathanArkathan Posts: 65
    edited December 1969

    Jaderail,

    If it's not too much trouble, could you post your light/environment settings.
    I know I have to play around to eliminate grainy artifacts when using those lights and also have to bump up intensity.
    I'm sure others would also benefit from the settings..

  • SzarkSzark Posts: 10,634
    edited December 1969

    My tut lionked in post 2 above has all the info you need Arkathan when it comes to Area Lighting.

  • whispers65whispers65 Posts: 952
    edited December 1969

    Jaderail said:
    1. Use the Uber Area Base on the Screen of the TV, add the Image you like to the Diffuse Channel of the Screen set to 100% white and Again to the Ambient Channel of the Screen also set to 100% white and full strength. For the Uber Area Light setting RAMP the strength VERY high and ONLY touch the Falloff END and not the Falloff Start.

    okie thanks. I tried it. I'm sure I'm doing something wrong still. In the one pic, it shows the image set on the screen under the Diffuse Channel.

    This particular TV has it divided into TV, Stand, and Screen. I put the Uber Area Base on the Screen by select the screen in the surfaces tab and the CTRL clicking and ignoring changing the textures. I then put the picture on the Diffuse channel under the screen as shown. I turned on Ambient and set it to white also. I then adjust the intensity to like 200 and then changed the samples to 128 to eliminate the graininess on the first attempt.

    But no picture on the Tube. Maybe the TV is broken. :(

    sample.jpg
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    Screenshot_(13).png
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  • ArkathanArkathan Posts: 65
    edited December 1969

    D'oh! Thanks Pete!

  • SzarkSzark Posts: 10,634
    edited December 1969

    whispers65 put the diffuse map (texture) in to the Ambient Colour Channel and try again. Also lower the Ambient Strength to 100%. TV screnn don't glow that much. :)

    My pleasure Arkathan

  • whispers65whispers65 Posts: 952
    edited December 1969

    Szark said:
    whispers65 put the diffuse map (texture) in to the Ambient Colour Channel and try again. Also lower the Ambient Strength to 100%. TV screnn don't glow that much. :)

    My pleasure Arkathan

    ok here are the new results. It worked!!! I turned it down to 100% and it still may be too bright even for a big screen TV but the entire point is thanks to you I now know how this stuff works and I can play around with intensity, color, and so forth to achieve the results I want.

    I really get it now.

    Thank you very much for your time and effort!

    sampleb.jpg
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  • SzarkSzark Posts: 10,634
    edited December 1969

    You are most welcome.

    You can get some funky results, probably not good for this but you could try putting the diffuse map in the light colour channel and see what it looks like for comparison. I have tried this and it depends on the quailty of the diffuse map. Yours looks quite good so it may work better.

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