Experience with per pixel lighting?
polycounter lvl 18
hey guys,
I know this belongs in a different channel but, I wanted to get everyone's attention for sure.
Does anyone here know howto do per pixel lighting? And perhaps looking for work?
If so, please let me know asap.
rpatel AT easel3d.net
-R
I know this belongs in a different channel but, I wanted to get everyone's attention for sure.
Does anyone here know howto do per pixel lighting? And perhaps looking for work?
If so, please let me know asap.
rpatel AT easel3d.net
-R
Replies
I have my own guesses of how it is but I have no real expeirience with it.
http://developer.nvidia.com/attach/6688
-do you understand howto harness the power of per pixel fall off from per pixel lights.
-do you know howto tweak a spec map on a per light basis (spec power settings usually have to customized per lit scene, it's a limitation I have seen across every engine i have worked with)
-vertex lighting allowed for tweaks of the vertex colors to 'fudge;' the lighting. Those controls are now pushed onto the textures on a per pixel level. Do you know howto control these variables.
The reason I wasnt spacific is that if you know these things, you wouldnt really need clairifcation, it's my guess those peope who are familiar withn these attributes of PPL don't need to ask such questions...but maybe i was assuming too much.
Thx for the heads' up Daz...
-R
Surely you can just make a specular map and it'll react properly in any lighting conditions if the lights are set up right and the value range of the spec map creates results to mimic realism?
Also you might wanna edit that 9 into a bracket, it was confusing me, I thought you were saying 9 spec maps needed to be customised per scene
more just values associated with it?
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Right you are mop. Spec power not the pixels (in cases I've seen, anyways)
I can think of one engine where there is a spec power map: Unreal 3. In this case you would need to change the pixel data to change the spec power.
-R
And why would you need to change this "spec power" depending on the scene? That sounds pretty wasteful - surely just one map should be made to work for any lighting situation?
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Well... different spec colors might be good for daylight/dungeon/etc maybe? But yeah I would think that if you need differences per-light, properties on the lights should suffice.
Whoops. Didn't mean for it to sound snippy.
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-R
-do you understand howto harness the power of per pixel fall off from per pixel lights.
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You might want to get a clearer definition of what your AD is asking for here. Falloff could be the near and far distance ranges that each light's intensity ramps up/down. Not a per-pixel effect, but per-light.
Or the falloff he/she is speaking of could be a Fresnel type of effect, where the intensity of the light reflecting off the surface could be increased depending on the normals of the surface (brighter along the edges, or the inverse). This could be masked per-pixel with a grayscale map (or even colored with RGB, similar to specular color mapping).
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-do you know howto tweak a spec map on a per light basis (spec power settings usually have to customized per lit scene...
[/ QUOTE ]Again, ask for clarification. Sounds like you want to just alter the materials for separate objects, so each has different specular values, instead of making multiple materials for the same entity that are each applied depending on which light is hitting it.
The latter might be cool, but you'd have to be very careful since the engine would likely have to render each surface multiple times for each light's material (lots of passes can equal poor performance), then additively-composite the materials together to make the final surface (can quickly overbright the surface).
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-vertex lighting allowed for tweaks of the vertex colors to 'fudge;' the lighting. Those controls are now pushed onto the textures on a per pixel level. Do you know howto control these variables.
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Not difficult, most engines allow this. Adjust the vertex color in your 3D app. Your app should allow you to bake lighting into vertex colors, and you should also be able to paint/alter the colors too.
The vertex color is usually multiplied against the bitmaps to get the final surface color. Other math ops can be used, to allow the vertex color to both brighten and darken the bitmaps for better color range (similar to the Overlay op in Photoshop), or they can use just plain old additive. Makes a big difference which op is used, you'll have to adjust your bitmaps to work well with it.
Dunno if that helps. Again, ask your AD (and the programmers) more questions. Keep pestering them until you understand how things really work.
I was tryna think on my feet here, i should have anticipated how quickly you guys would disect every word.
So any takers?
-R
No hard feelings there PaK. I think most artists around here are just excited by the mention of per-pixel anything. I know I am!
Good luck with your search. And do try posting in the Paid section, probably get more hits.
So dont accuse me of anything, I wasn't insulting anyone. When was the last time I insulted Eric, Daz or anyone is this thread? *whatever*
-R
-R
Per is also right that your questions were very vague... and no, it's not that "you know what you were after" that counts - it's other people understanding what you're after that counts.
Surely you, who talks about workflow and pipeline all the time, should understand the importance of clear communication.
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