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Color rate

arno

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Hi all,

While debuging a MCX visualization issue of the particle effects I came across a possible issue with the color rate values. In many FX file I see:

Code:
Color Rate=0.00, 0.00

According to the SDK when the percentage of the lifetime of the particle is below the first value the start color is shown, when it is bigger than the end value the end color is shown and in between they are blended. But with both values at zero this would mean that the end color is always shown. Many particle have a end color that has an alpha of zero, so that would mean the particle would never show. This sounds not logical to me.

Does anybody know if a color rate of zero and zero maybe has a special meaning? The SDK documentation is not that clear on this.
 

arno

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Disregard part of the question above, the alpha value is always taken from the start color I read in the SDK afterwards.

But also the fade in and fade out values often have 0.00 for all values. Does that mean they do not fade or are they always faded out then? Also from the SDK it is not clear how quickly they will fade (the values seem to indicate the point at which they fade only).

If anybody knows more details about that, I would be happy to hear :)
 

DragonflightDesign

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Hi Arno

I recently spent a long time building engine fire/smoke effects. AFAICT using 0.00 caused an instant 'on/off' effect. I can't give you a definitive response to 'how long' but I'd observe that smoke effects that trail behind an aircraft appeared to take longer to fade out than smoke from a static fire with the same values. This could simply be because smoke trails are stretched out and it's a visual effect of that.

-Dai
 
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