SPARK2 Any solution for black smoke ?

Hi ! I want to create a black smoke effect.Tried with multiplicative blending which works but particles won't fade out.
Any ideas for : fading out black smoke effect ?

Thanks

Hi, what do you mean particles wont fade out ?

When using alpha blending (multiplicative), particles need to be sorted in z :

Code:

myGroup->enableSorting(true)

And for sorting to be correct, the camera position must be specified in system space for each systems containing groups that need to be sorted :

Code:

mySystem->setCameraPosition(cameraPos)

Thanks , but it seems i fixed it :

Code:

g_pD3DDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_REVSUBTRACT);

Now i have beautiful black particles which can fade out

Code:

Hi, what do you mean particles wont fade out ?

Well if i use multiplicative blending the particles just pops when they die (no alpha fade)
The color interpolator's alpha component has no effect on them for some reason

Ok so there seems to be a bug in the DirectX renderers

Maybe you should add substractive blending as an option to blending modes , Just an idea...
anyway this substractive black smoke effect is definitely beautiful.

BTW : Did you received my randomTank modifier source ? i sent to you in PM...

i will look at dx renderer to correct it.

Hi here are some demos of the subtractive blending mode... Looks really cool !

videos :

https://www.youtube.com/watch?v=GMlKCCb7i-w
https://www.youtube.com/watch?v=LA6P5jUSFTU

binaries :

http://pinkcatgames.ucoz.com/spark_files/SPARK_Demos.rar

Nice,

Maybe I ll add it. It can be cool for some specific effects (like dark magic or so)
But for a classic smoke, I d stay with normal alpha blending because you may want smokes of different colours...

PS : I know you didnt manage to get alpha blending work and that s strange. I ll make some tests

Thanks ! Actually you can use any color you wish ! The color interpolators will work exacly the same way , the only difference is that the pixels are subtracted from the "background" So the particles will be always darker than the background.

https://www.youtube.com/watch?v=jExCfmL_Crw

It's very useful when you need very dark smoke (and actually i need it in my game all the time)
flamable man-made materials and mostly gasoline smoke (exploded cars) will have black smoke.