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Befuddled! How to use jpg as image on television surface? Tiling and offset issues!

posecastposecast Posts: 386
edited May 2018 in The Commons

I am trying something that has me scratching my head. How do the tiling and offsets work? I have a 16x9 image that I am trying to map to a television surface, and the image is doubled and offset top to bottom about 50 percent. I feel like it should just line up if I set it to 1 tile horizontal and 1 tile vertical, but its not working. Can someone explain how it works?

Thank you!

Post edited by posecast on

Comments

  • carrie58carrie58 Posts: 4,088

    Have you looked at the texture map for the tv?

  • posecastposecast Posts: 386

    there isn't one...it's just a color. i got the tv from 3d warehouse.

  • posecastposecast Posts: 386

    Ok so I guess i need to load it into uvlayout or something to fix that. I guess I can just create a new plane and slip it into place until I learn about that aspect of uvmapping.

     

  • ChezjuanChezjuan Posts: 538

    It depends on the resolution of the surface on which you are trying to map vs the resolution of the image you are mapping.

    Basically, set up the tiling so you get the proper width and height, and use offset to line it up. It takes a little playing around to get it right. The good thing is that generally if you want to replace the image, as long as you use the same resolution in a replacement, you shouldn't have to mess with the tiling and offset.

    Another thing to note is that if you are rendering in Iray, you need to apply the image map to the default and emmisive if you want it to appear that the TV is on. Plus, the alignment in Iray can be different than it appears in OpenGL, so you may have it look great in the viewport, only to have it off center in the final render (in which case you need to use the iray preview to adjust the offset).

    One thing I've done in the past is to copy the TV texture, then use an image editing program to put the image on the screen portion of the texture. That avoids having to mess with tiling and offset. The downside is that it takes longer to try several different images in a render, since I would need to make that many different textures.

  • posecastposecast Posts: 386

    Thank you!

  • jakibluejakiblue Posts: 7,281

     this is something i was trying to figure out the other day. I was able to use an image in the surfaces to get the tv look like it was showing something, but i coudln't for the life of me figure out how to have it lit so it looked like it was on, particularly in a dark room. 

    Chezjuan said:

     

    Another thing to note is that if you are rendering in Iray, you need to apply the image map to the default and emmisive if you want it to appear that the TV is on.

     

  • FishtalesFishtales Posts: 6,212

    @jakiblue

    Put the tv image in the Emissive channel and turn the colour to white then lower the Lumen to 5. If the light is too dark raise the lumen, if too bright lower it.

  • macleanmaclean Posts: 2,438

    Select the TV material, look in the camera dropdown menu and Choose UV View (or whatever it's called). That will show you the uv map and give you a better idea of what you need to do to fix it.

    Btw, as an added extra bonus this-week-only info point, setting Horizontal Offset to -1 will flip the texture, (Vertical Offset too).

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