catchyid Posted November 4, 2016 Share Posted November 4, 2016 Hi, I am using the default Pyro simulation parameters (i.e. shelf tool -> Pyro FX -> Explosion), when I render the scene I get a very pixelated image? i.e. many isolated dots where smoke should be. I checked the rendering setting and "Ray Tracing" is set as default renderer, and Pixel Samples is set to 3x3. I am wondering why I get these isolated dots instead of a continues smoke? Thanks, Quote Link to comment Share on other sites More sharing options...
dimovfx Posted November 4, 2016 Share Posted November 4, 2016 You might want to play with Volume Quality option in Mantra node. Quote Link to comment Share on other sites More sharing options...
catchyid Posted November 4, 2016 Author Share Posted November 4, 2016 (edited) Thanks...Increasing the Volume quality improved the fire "look" but did not remove those pixels. When I increased the samples per pixel to 7x7, the problem is almost gone, when I increased to 10x10 the image looked good. I wish there was a shorter way to fix this problem because this means looooots of rendering time I remember I did not need such 10x10 samples when I used fumeFX in Maya... Edited November 4, 2016 by catchyid Quote Link to comment Share on other sites More sharing options...
LaidlawFX Posted November 4, 2016 Share Posted November 4, 2016 Switch your rendering engine to micro-polygon pbr. Use this for all volume rendering. Look up the help on stochastic transparency, volume quality as mentioned, also check the volume resolution of your sim. Quote Link to comment Share on other sites More sharing options...
catchyid Posted November 4, 2016 Author Share Posted November 4, 2016 (edited) okay guys...seems like I need to read more Mantra documentation Thanks Ben, Thanks Alexander Edited November 4, 2016 by catchyid Quote Link to comment Share on other sites More sharing options...
mosssi Posted November 5, 2016 Share Posted November 5, 2016 Also check you renders when you composite those on a background. sometimes its just your alpha issue and you can see very low amount of alpha on a black background. Quote Link to comment Share on other sites More sharing options...
catchyid Posted November 6, 2016 Author Share Posted November 6, 2016 Just an update...Yes, improving Volume quality improves it (but this is like increasing the pixel sampling rate, i.e. it affects the entire volume), so it's best to enable stochastic sampling and use a high value like 40. @mosssi, I am not sure I understand you entirely, could you please elaborate more on? Thanks Quote Link to comment Share on other sites More sharing options...
mosssi Posted November 6, 2016 Share Posted November 6, 2016 46 minutes ago, catchyid said: @mosssi, I am not sure I understand you entirely, could you please elaborate more on? I mean check the alpha value of the pixelated area. usually it's something between 0.05 and 0.01 so it won't add pixel effect to your composited image. 1 Quote Link to comment Share on other sites More sharing options...
catchyid Posted November 6, 2016 Author Share Posted November 6, 2016 I see, thanks will check that I have not tested, but this also one way to mitigate the problem... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.