Animated Glow On A Tv

[benjaminhealy]

Hi, first off Im going to say that I'm pretty new to lighting(as far as getting it right) but Im really trying to make a nice looking piece involving a tv set.

Im making a video rendered as an image sequence in After Effects to creat a movie which Im then planar mapping to a tv screen in Maya. Im trying to replicate the tv giving off the glow it does when something is on and that fact that the glow intensity changes depending on what is on.

I tried applying a sequence of black frames and white frames to the glow intensity of the screen but that didnt seem to work. I was expecting it to be less intense when black was shown and more intense on white.

Anyway here is what I've got so far, a key light from above with fog on and a couple of fill lights, then I've also put final gather on.

so Im basically after a glow which i can have animated with an image sequence which I will use for the screens colour.

[drblacksnake]

first of all glow is single float parameter so it means You should take intensity curve from your image - there are node rgb_to_hsv, which would give You necessary feed. Also think about adding a lightsource to the screen (because it emits light) and map original image sequence to its color, so it will affect lighting of surrounding surfaces. put some decay rate for that lightsource and increase its intensity so effect is visible.

[benjaminhealy]

Thanks,

I'm not sure about what you mean by the RBG_to_HSV thing do I have to find this in the hypershade as it doesnt show up anything really in attributes. Do you mean converting the screen's colour channel to HSV. And then where do you put the image sequence for the intensity of the glow?

take it i have to creat RGB_HSV node in hypershade then connect it to blinn. Could you explain the work around briefly as I have'nt got it working just yet.

cheers

Ben

[benjaminhealy]

Ok so far I've got this effect but Im not sure how to control it or if I've done it right. as in its a bit bright and i need to next figure out how to make an image sequence affect the glow

but here is what I did.

i created HGB_RSV node then i hooked up the outcolorR outcolorG and outcolourB to the corresponding InRGB's of the rgb_hsv node.

Then I hooked up the RBG_HSV (out Hsv V) to the glow intensity.

Thanks

[benjaminhealy]

I think I've got it sussed with a little help

I put the movie file through and RGB luminance node and then divided it as it went into the glow intensity of the blinn.

here are the results, using a dummy balck and white screen to see if it worked.

glow

Thanks

Ben

[davesrose]

Ben,

Have you tried using a surface shader instead of blinn for the image? I would think that would give you a stronger, more intense glow.

QUOTE(Ben Healy @ 09/05/06, 09:42 AM) [snapback]246898[/snapback]
I think I've got it sussed with a little help
I put the movie file through and RGB luminance node and then divided it as it went into the glow intensity of the blinn.

here are the results, using a dummy balck and white screen to see if it worked.
glow

Thanks

Ben