Sky Colours - A Practical Analytic Model for Daylight

jamessharpe · 2003-06-09T12:48:42

I''m trying to implement "A Practical Analytic Model for Daylight" to get vertex colours for a skydome, however I am getting very large values for the luminance. This is causing my vertex colour calculations to overflow(stored as unsigned chars), and gives colours that are undesirable. Can anyone tell me how I should scale the luminance value so it is in the correct range?

Graphics and GPU Programming Programming

Started by jamessharpe June 02, 2003 12:08 PM

20 comments, last by jamessharpe 20 years, 10 months ago

Anonymous

June 09, 2003 12:16 PM

quote:Original post by jamessharpe
AP, if that were true then why is there not a direct matrix conversion between RGB and HSV. You are implying a linear relationship between RGB and HSV, but I don''t think that there is one, correct me if i''m wrong.

If you double each RGB coordinate, the hue and saturation do not change. Only the value doubles. This is not a linear change of coordinates.

jamessharpe

497

Author

June 09, 2003 12:48 PM

Ok, thanks for clearing that up. I realise my confusion, was that i was looking for linear relationship between all the components and not one between just one element and the other three.

Sky Colours - A Practical Analytic Model for Daylight

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Sky Colours - A Practical Analytic Model for Daylight

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