aminur rahman Posted July 10, 2013 Share Posted July 10, 2013 (edited) Hello all. I'm rendering this 4800x1800 image. All the v-ray settings screenshots and the scene I'm rendering is given here for your kind help. It's almost 16 hours and still the light cache building is not complete. Time frame is killing me. I'm asking for help here. Machine is i7-2600 3.4GHz, 16GB RAM, Radeon HD 7750. Please, suggest me something with the light settings or v-ray settings. Material editing now would be a tough job to do. If no other way, suggest something with the material that is quick to do. One more thing. There's only one light in the scene. And that's a V-ray sun. Edited July 10, 2013 by dimitrirahman Link to comment Share on other sites More sharing options...
cg_Butler Posted July 10, 2013 Share Posted July 10, 2013 Firstly tick use light cache for glossy rays. That will reduce render times dramatically. How many cores do you have? If it is more than 8, increase the number of passes in the LC to the number of cores you have so they will all be used to generate the LC. It may also be your displacement setup, but without seeing that I can't comment. What I have suggested should give you a big improvement though. Let me know if it helps. Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 thanks for the very quick response. ticked it and rendering is going on. i'll let you know the render time. 3 questions to you- 1. is it core dependent or thread? mine has 4 cores, 8 threads. what should i do? 2. what about the displacement setup? 3. this one's irrelevant, you know i'm new here. how to change the forum user name? :-) Link to comment Share on other sites More sharing options...
cg_Butler Posted July 10, 2013 Share Posted July 10, 2013 No problem. I hope it seems quicker! 1. It is thread dependent. If you have 8 threads then leave it on 8. I have 32 so I put it on 32 so all threads can be used when generating the LC. 2. I noticed you are overriding the Displacement settings. You may need to increase the edge length because your image is fairly hi res. 3. I think you have to email Jeff and ask. Check this link http://forums.cgarchitect.com/70762-changing-forum-username.html Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 well, it seems a bit faster, still far from being acceptable. anything else, dear? Link to comment Share on other sites More sharing options...
notamondayfan Posted July 10, 2013 Share Posted July 10, 2013 You need to establish what is causing the long LC times. Firstly try putting a blank vray material in the override slot, and see if that speeds things up. If so then it's material issues. If not then turn off your lights, and try again. Then try turning off displacement. Then finally try hiding objects / layers. Once you know what's causing the issues you can then go about fixing the problem. I would expect the LC on a scene like yours to take no more than a few mins, so anything over 1 hour indicates something is wrong somewhere. Dean Link to comment Share on other sites More sharing options...
cg_Butler Posted July 10, 2013 Share Posted July 10, 2013 I have a hunch it's either the displacement or some glass that has no thickness...... Those are killers for LC. Link to comment Share on other sites More sharing options...
Nic H Posted July 10, 2013 Share Posted July 10, 2013 check for 3d displacement or huge amounts of proxies lc should take less than 5 mins at most for a scene like this Link to comment Share on other sites More sharing options...
Zdravko Barisic Posted July 10, 2013 Share Posted July 10, 2013 Have you already set your dynamic memory limit? Also, as this is urgent, avoid LC and go fot PHOTON MAP instead of it. Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 You need to establish what is causing the long LC times. Firstly try putting a blank vray material in the override slot, and see if that speeds things up. If so then it's material issues. If not then turn off your lights, and try again. Then try turning off displacement. Then finally try hiding objects / layers. Once you know what's causing the issues you can then go about fixing the problem. I would expect the LC on a scene like yours to take no more than a few mins, so anything over 1 hour indicates something is wrong somewhere. Dean Putting a blank v-ray material in the override slot worked. Means it's a material issue. What to do now?? A lot of glossy things in the scene. I'm not very good at material related troubleshooting. Most of the models are evermotion archmodels. Could you please suggest something in details?? Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 I have a hunch it's either the displacement or some glass that has no thickness...... Those are killers for LC. But seems it's not the issue here. Unchecking displacement didn't work. I could figure it out according to the suggestion of Dean Punchard. What to do now?? Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 Have you already set your dynamic memory limit? Also, as this is urgent, avoid LC and go fot PHOTON MAP instead of it. Dynamic memory limit is okay. Could you please suggest the settings I should use for PHOTON MAP? Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 check for 3d displacement or huge amounts of proxies lc should take less than 5 mins at most for a scene like this Proxy is not the issue in this case i guess. :-( Link to comment Share on other sites More sharing options...
notamondayfan Posted July 10, 2013 Share Posted July 10, 2013 Dynamic memory limit is okay. Could you please suggest the settings I should use for PHOTON MAP? I wouldnt use photon map, all you'll be doing is side stepping the problem instead of addressing it, and to be honest photon map is pretty much redundant and I wouldnt use it at all. I'd rather brute force! Link to comment Share on other sites More sharing options...
notamondayfan Posted July 10, 2013 Share Posted July 10, 2013 Anyway, for materials, your probably right as Evermotion have some stupid settings on their materials! I always check any materials from any 3d model before putting it in my scenes, simply because a lot of people / companies are useless! So first, download http://www.scriptspot.com/3ds-max/scripts/vmc-vray-material-control vray material control script. This allows you to globally control your materials. I would change reflection and refraction sub divs to 8, displace off, use interpolation off. If you're still having problems, you need to identify what object / material is causing the issue. Hide half of your objects, render, and see if it's still happening. If it stops, then you know an object you just hidden will have the bad material. Repeat this until you find the material. Sounds tedious but actually it won't take that long as you will be dividing the objects in half each time. If that still doesn't work, send over the file. Dean Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 I wouldnt use photon map, all you'll be doing is side stepping the problem instead of addressing it, and to be honest photon map is pretty much redundant and I wouldnt use it at all. I'd rather brute force! God!! You are back,dear! Well, suggest something to solve the problem. How to solve this material issue? If using brute force is the way, suggest some settings for it. Never used anything other than LC and don't have time to test now. Save me this time!!!!! :-( Link to comment Share on other sites More sharing options...
notamondayfan Posted July 10, 2013 Share Posted July 10, 2013 God!! You are back,dear! Well, suggest something to solve the problem. How to solve this material issue? If using brute force is the way, suggest some settings for it. Never used anything other than LC and don't have time to test now. Save me this time!!!!! :-( Press refresh. Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 Anyway, for materials, your probably right as Evermotion have some stupid settings on their materials! I always check any materials from any 3d model before putting it in my scenes, simply because a lot of people / companies are useless! So first, download http://www.scriptspot.com/3ds-max/scripts/vmc-vray-material-control vray material control script. This allows you to globally control your materials. I would change reflection and refraction sub divs to 8, displace off, use interpolation off. If you're still having problems, you need to identify what object / material is causing the issue. Hide half of your objects, render, and see if it's still happening. If it stops, then you know an object you just hidden will have the bad material. Repeat this until you find the material. Sounds tedious but actually it won't take that long as you will be dividing the objects in half each time. If that still doesn't work, send over the file. Dean Thanks a ton. On it. I'll let you know as soon as I can figure something out. Sad news is I'm a noob which means the file size is around 1.5GB and considering the internet speed i get here it's practically impossible to upload this file in any less than 48 hours. Please, pray for me ;-). Link to comment Share on other sites More sharing options...
notamondayfan Posted July 10, 2013 Share Posted July 10, 2013 Bummer, also that may be a cause of some of the speed issues. Some tough lessons to learn, we've all been there! Good luck! Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 Anyway, for materials, your probably right as Evermotion have some stupid settings on their materials! I always check any materials from any 3d model before putting it in my scenes, simply because a lot of people / companies are useless! So first, download http://www.scriptspot.com/3ds-max/scripts/vmc-vray-material-control vray material control script. This allows you to globally control your materials. I would change reflection and refraction sub divs to 8, displace off, use interpolation off. If you're still having problems, you need to identify what object / material is causing the issue. Hide half of your objects, render, and see if it's still happening. If it stops, then you know an object you just hidden will have the bad material. Repeat this until you find the material. Sounds tedious but actually it won't take that long as you will be dividing the objects in half each time. If that still doesn't work, send over the file. Dean One word- GRATITUDE. Things with the script couldn't cut the LC time. What worked is finding the culprit objects. I really thought that would be tedious. But your advice worked so nice. Dosch cars were the culprits. You saved me. Thanks a lot dear, thanks a lot. Link to comment Share on other sites More sharing options...
cg_Butler Posted July 10, 2013 Share Posted July 10, 2013 Did you have any materials with displacement on? If so, ill suggest again that you re render your file as it was without the override but with displacement turned off. That way you are ruling out displacement and not simply guessing what material it might be. If its still slow with displacement on then its likely either a material with displacement or something like too many subdivision on lots of glossy materials. I'm still saying displacement!! Link to comment Share on other sites More sharing options...
cg_Butler Posted July 10, 2013 Share Posted July 10, 2013 Okay, ignore my last post. I did it through my phone and hadn't read all the previous. Kudos to Dean! Glad you fixed it. Link to comment Share on other sites More sharing options...
aminur rahman Posted July 10, 2013 Author Share Posted July 10, 2013 Okay, ignore my last post. I did it through my phone and hadn't read all the previous. Kudos to Dean! Glad you fixed it. Still thanks. You people are so kind and helpful. Link to comment Share on other sites More sharing options...
notamondayfan Posted July 11, 2013 Share Posted July 11, 2013 Glad you sorted it! Dean Link to comment Share on other sites More sharing options...
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