lynbo Posted September 29, 2004 Share Posted September 29, 2004 Hey all I'm having trouble with i3d render. I have a fast moving object in my scene and no matter what params I adjust in either the metacloud or the output or texturefog I get streaky render. I tried different inherit velocity on, of,f 0, 1, settings and I am looking for some idea where to try and fix this. I'll send screens and a file in a bit. I have to get back to my own machine first. Thanks Quote Link to comment Share on other sites More sharing options...
edward Posted September 30, 2004 Share Posted September 30, 2004 This happens in H7? Quote Link to comment Share on other sites More sharing options...
lynbo Posted September 30, 2004 Author Share Posted September 30, 2004 This happens in H7? 14050[/snapback] Actually I started the scene in 6.1 and moved it up to 7 then did some tests independent of my scene, just with objects moving at the same speed to see if possibly the scene had something wrong with it but I got the same results. There seems to be a limit because the first time I tried it everything looked great, but it seems I wasnt moving fast enough. When I replicated the movement more precisely I got the same streaky render. Hang on... heres an image the top half is the contrail tutorial from techimage, the bottom one is a fast moving emmiter (cylinder geo) moving from offscreen top to bottom. I would like to get the same results in both. The settings for the volumefog and i3d stuff is almost the same for these two scenes, just a few tweaks and such but nothing that would cause this. The contrail image is what I was going for... but you knew that . Thanks Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted September 30, 2004 Share Posted September 30, 2004 Hey there, Perhaps it's the division setting of the i3d generator? Because when you have a contrail that travels couple miles long, the voxel space get stretched from the insufficient subdivision in one of the axis. Perhaps that's the problem? Another thing is, though I don't know if this has been fixed in H7, is that the supersampling of the i3dGen is set too high, you may potentially have some straight line cut through a part of the i3d file. In this case, you probabaly want to lower the resolution -- which can potentially give you a better detail sometimes. HTH, Alex Quote Link to comment Share on other sites More sharing options...
lynbo Posted September 30, 2004 Author Share Posted September 30, 2004 Hey there,Perhaps it's the division setting of the i3d generator? Because when you have a contrail that travels couple miles long, the voxel space get stretched from the insufficient subdivision in one of the axis. Perhaps that's the problem? Another thing is, though I don't know if this has been fixed in H7, is that the supersampling of the i3dGen is set too high, you may potentially have some straight line cut through a part of the i3d file. In this case, you probabaly want to lower the resolution -- which can potentially give you a better detail sometimes. HTH, Alex 14057[/snapback] Hey Alex I have another grab here that shows the metaballs wireframe and the render region. It shows the sreaking better. I can understand if this is a subsample problem but I cranked up oversampling. it didnt seem to have any effect except to take longer. I have tried lowering resolution to 32 which seemed to be better but not good enough. When you say i3d vision setting what parameter exaxctly do you mean? I think I adjusted every widget in the interface. Hmmmm.... BTW what is HTH? Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted October 1, 2004 Share Posted October 1, 2004 Hey AlexI have another grab here that shows the metaballs wireframe and the render region. It shows the sreaking better. I can understand if this is a subsample problem but I cranked up oversampling. it didnt seem to have any effect except to take longer. I have tried lowering resolution to 32 which seemed to be better but not good enough. When you say i3d vision setting what parameter exaxctly do you mean? I think I adjusted every widget in the interface. Hmmmm.... BTW what is HTH? 14059[/snapback] Eeeeep. I meant to say "turn down the Oversampling" to like 2 or something. an crank up the resolution in one of the axis where it's the longest -- like 64x128x64 or something. Any chance that you can post a larger picture or something? It's kinda hard to see the renders. Also another thing you might like to take a look at is the volumetric shader's "Step Size" (smaller step size would produce finer detail) -- depending on the size of the over scene. HTH stands for "Hope That Helped". (Or so I think...) -Alex Quote Link to comment Share on other sites More sharing options...
lynbo Posted October 1, 2004 Author Share Posted October 1, 2004 Eeeeep. I meant to say "turn down the Oversampling" to like 2 or something. an crank up the resolution in one of the axis where it's the longest -- like 64x128x64 or something. Any chance that you can post a larger picture or something? It's kinda hard to see the renders.Also another thing you might like to take a look at is the volumetric shader's "Step Size" (smaller step size would produce finer detail) -- depending on the size of the over scene. HTH stands for "Hope That Helped". (Or so I think...) -Alex 14060[/snapback] Oh right HTH got it I have tried oversampling up and down the scale but I dont think I tried anything as small as 2. I will try 64 128 64 I usually keep those the same, but why should I? I completely overlooked that. DUH? I have tried step size at anything form .002 -> 1 just for fun. Here is a larger render for you. Notice the blockiness. This render is after I adjusted the speed of the object to be about half of what it was. I'm trying not to post any large images unless I need to. Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted October 1, 2004 Share Posted October 1, 2004 Hmm... I see I see... Not sure what else I can think of at the moment. I'll have to give it a try later today to see if I can reproduce that same problem. Quote Link to comment Share on other sites More sharing options...
lynbo Posted October 1, 2004 Author Share Posted October 1, 2004 Hmm... I see I see... Not sure what else I can think of at the moment. I'll have to give it a try later today to see if I can reproduce that same problem. 14066[/snapback] cool thanks! I'll keep at it on my end. Quote Link to comment Share on other sites More sharing options...
lynbo Posted October 4, 2004 Author Share Posted October 4, 2004 Hmm... I see I see... Not sure what else I can think of at the moment. I'll have to give it a try later today to see if I can reproduce that same problem. 14066[/snapback] Hey Alex Well I decided to start over with this scene in a different version. It works fine now. Even though I tried these fast moving objects by themselves in a newer version. So it would seem that the old nodes dont play nice with the new nodes. I had opened this scene (which was built in 6.1.208) in 7 and as you saw had the same problem. Well anyhoo let me know if you could repro this. Thanks Quote Link to comment Share on other sites More sharing options...
TheUsualAlex Posted October 4, 2004 Share Posted October 4, 2004 Hey AlexWell I decided to start over with this scene in a different version. It works fine now. Even though I tried these fast moving objects by themselves in a newer version. So it would seem that the old nodes dont play nice with the new nodes. I had opened this scene (which was built in 6.1.208) in 7 and as you saw had the same problem. Well anyhoo let me know if you could repro this. Thanks 14095[/snapback] Hi Lyn, That's interesting... Puzzling too. I haven't had a chance to actually play with the volumetric rendering just yet as I was trying to get a problem solved at work. Though I did have a little bit of chance to play with the i3d, but not for volumetric rendering, tho. Glad to konw you got it to work. -A Quote Link to comment Share on other sites More sharing options...
lynbo Posted October 5, 2004 Author Share Posted October 5, 2004 Hey ALex Thanks for your help. Quote Link to comment Share on other sites More sharing options...
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