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Light question

Graphics and GPU Programming Programming

Started by kslam November 07, 2006 07:56 PM

5 comments, last by JasonBlochowiak 17 years, 5 months ago

kslam

122

Author

November 07, 2006 07:56 PM

Hi All, I got question, how to calculate the Final Object colour = object color * Light_Ambient (If only got ambient light) It is, object color * Light_Ambient or object color + Light_Ambient / 2 to get the Final Object colour ? (256, G, B) * (128, G, B) = 32768(>256) (256, G, B) + (128, G, B) /2 = 192 ???

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dbzprogrammer

100

November 07, 2006 08:09 PM

You add together ambient, diffuse, and specular. So, yes, you add it, not multiply.

We should do this the Microsoft way: "WAHOOOO!!! IT COMPILES! SHIP IT!"

Mastaba

761

November 07, 2006 09:09 PM

For most lighting models, you multiply the material properties by the respective light properties, and add the products together in some fashion.

[Edited by - Mastaba on November 7, 2006 10:09:09 PM]

.

StealthNinja

163

November 07, 2006 09:41 PM

You should note that colors are usualy changed to be in a 0 to 1 range when doing the math.

Woodchuck

246

November 09, 2006 11:21 AM

FinalColor = Color_object*( AmbientLight + DiffuseLight + SpecularLight + EmissiveLight )

eliuk

122

November 09, 2006 05:43 PM

Yeah u usually clamp it to be between 0 and 1;

Steve-O

JasonBlochowiak

JasonBlochowiak

601

November 10, 2006 12:22 PM

Quote:Original post by eliuk
Yeah u usually clamp it to be between 0 and 1;

Not so much these days - HDR lighting requires that you don't clamp the result.

This topic is closed to new replies.

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