Jason Posted November 17, 2007 Share Posted November 17, 2007 Rendering in mantra takes near 20 min! Its terrible! But i don't know how to improve render time, i'm novice in mantra In this scene i have 1.3 million vertices, raytraced shadows and Global Illumination (full irradiance, 32 samples) If i do renders with Global Illumination Matra renders 2 frames - 1st something white 256x256 and 2nd goes my picture. After turning off Global Illumination mantra doesn't render 1st white frame... Really? That doesn't sound great. Any chance you could zip up this geometry and let us give it a try? Quote Link to comment Share on other sites More sharing options...
mentor Posted November 19, 2007 Author Share Posted November 19, 2007 Yes, but later, i'm slightly busy Quote Link to comment Share on other sites More sharing options...
peliosis Posted November 22, 2007 Share Posted November 22, 2007 Rendering in mantra takes near 20 min! Its terrible! Have you checked "irradiance caching" and played with the settings? Of course you are likely to achieve the cleanest result with irradiance caching off and something like 256 samples but I'm not sure if it is worth it Also, if your geometry is imported it's all very heavy. If you'd use curves with witdh attribute instead of polys, rendertime and memory usage would be much more efficient and you could try rendering a forest. Thad should leave any MR/Vray far behind. Quote Link to comment Share on other sites More sharing options...
mentor Posted November 22, 2007 Author Share Posted November 22, 2007 (edited) Here is my scene - 11 mb - scene Edited January 16, 2008 by mentor Quote Link to comment Share on other sites More sharing options...
Jason Posted November 28, 2007 Share Posted November 28, 2007 Here is my scene - 11 mb - scene I noticed one thing that was kinda bugging me - it's a bug in the snow shader (which is a Simple Displacement material from the palette) - where it's adding some bad looking displacement to the polygons (offsetting each polygon individually, thereby making it look kinda faceted), giving it a rather crappy look. I've reported this bug to SESI. You're probably better off just creating your own little noisy displacement shader in VOPs until they fix it. This, I think, was also the reason for the slower render times. Raytracing against displaced surfaces is a bit slower and heavier than simple polygons. If you're really after some bump detail you could try add the "True Displacement" property to your shader, object or ROP and switch it off. This will simply bump the normals and your render shouldn't be any slower. I've also found that using irradiance caching and using pure Raytracing can lead to quicker renders on this scene (I instanced 250 of your trees around the place to test) Quote Link to comment Share on other sites More sharing options...
mrsmary Posted November 28, 2007 Share Posted November 28, 2007 man 41mb unzipped file. i manage to open it but every attempt to jumpback to obj level causes me fatal errors. would like to dig in this hip. Quote Link to comment Share on other sites More sharing options...
Jason Posted November 28, 2007 Share Posted November 28, 2007 Here is that forest of 250 point instanced trees. I think this took about 45 minutes, I'm not sure - I forgot to time it. I could've rendered a better image too... but anyway. Quote Link to comment Share on other sites More sharing options...
mentor Posted November 29, 2007 Author Share Posted November 29, 2007 Good news, snx! Quote Link to comment Share on other sites More sharing options...
hitch Posted December 6, 2007 Share Posted December 6, 2007 This is looking way cool, tnx for scene file, can-t wait to have a look how you did this when i get home from work Quote Link to comment Share on other sites More sharing options...
CeeGee Posted July 26, 2008 Share Posted July 26, 2008 I someone have this sceen, if can send me ona igorzcg@gmail.com Thanks in advanced... Quote Link to comment Share on other sites More sharing options...
nieming Posted February 8, 2009 Share Posted February 8, 2009 good job but that link is broken Quote Link to comment Share on other sites More sharing options...
udhay Posted July 28, 2009 Share Posted July 28, 2009 Hei Mentor I was trying for this effects in couple of days ago.. I didnt know this topic already existed..I like your result it looks good. Im sort of looking into creation of an environment with snow as well. The accumulation of snow on top of the buildings, Icicles and on various objects. just take a look and give me ur comments..... The images are just a WIP snapshots.... right now my icicles dont look like icicles at all....but i will get it done in a few days..Since im working on few stuff apart this for now. Quote Link to comment Share on other sites More sharing options...
RonensArt Posted August 1, 2009 Share Posted August 1, 2009 Here is that forest of 250 point instanced trees. I think this took about 45 minutes, I'm not sure - I forgot to time it. I could've rendered a better image too... but anyway. nice job I am not sure if ray tracing is needed in that case... Micropoly would be even more efficient. Great Render though Cheers, Ronen. Quote Link to comment Share on other sites More sharing options...
ykcosmo Posted January 13, 2011 Share Posted January 13, 2011 nice ! Quote Link to comment Share on other sites More sharing options...
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