Texture emission - a TV/Computer screen

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cyprine
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Posts: 70
Joined: Fri Jan 03, 2014 10:13 am
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Helloz !

i'm struggling with texture emission & rendering a nice looking computer screen.
http://cyprine2013.deviantart.com/art/g ... -483940349
as you can see, all the details from the spaceinvaders are blured from the texture emission.
i did try with a simple diffuse & emissive and this version above is a mix of the diffuse + (diffuse & emission) and none of them give me the desired result - the emitted texture is blured/burnt.
help !
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sikotik13
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Location: Iowa, United States

The best way I found for screens in general was to use the liveDB screen mat (think it's called matte screen, under misc), and inject the image I wanted. Then it's tweaking the amount of light output/sometimes changing the distribution (For particularly detailed pictures, I sometimes got better results switching that to the image as well). How exactly those two interact seemed to vary for me based on the image, but playing with just those two usually got it right.

Overall, I noticed clarity sharply drops as you ramp up the power. Anything over 1.2-1.5 will cause bleeding, which makes sense in a way. Unless you pixelate the image yourself in Photoshop or similar, it will never quite match up with reality, and in reality, the image is "broken" by the pixels themselves. This lowers the relative light output across the screen by breaking up a solid chunk of light into fragments. Kind of like an led light with 30 small bulbs can put out an equivalent light amount to one very high powered (comparatively) halogen with a fraction of the power. That power is still spread across many bulbs, and one bulb with the same power as the halogen would likely be obnoxiously over bright for the same application (taillights came to mind for this example). Raising the power above 1 is basically telling it to make the light bleed, since there is no separation, and in reality, most (lcd/led) screens don't really put out much light, as they only need to light themselves, and their power usage (read: light output) is pretty low. For example, the 23" LED monitor to my right has a total power consumption of <34 watts. A CRT of the same size would use approximately 115. The pixels would also likely be far more defined, breaking up the light more, but it would still be pushing more light out, hence the poorer relative contrast levels.

To sum up, if you are having bleeding issues, your power is probably too high. Try lowering it, and adjust the distribution to see if that gets it where you want it. If that fails to get the job done, you may need to tweak the contrast or "break up" the image yourself in a photo editor.
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cyprine
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Joined: Fri Jan 03, 2014 10:13 am
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ty for yr answer.
i did notice lowering power got me less bleeding but didnt try lower values than 5, ill give it a go with a longer exposure i guess.
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