derijones Posted May 23, 2005 Share Posted May 23, 2005 Hi folks Attached is a WIP of a new building - textured in Maya, rendered in Mental Ray with a HDRI dome and one simple area light for sun - Final Gather (800 rays) setting only (no GI). I keep getting these random black splodges - I can't see any connection with geometry. The FG previz doesn't appear to have any holes - only when it's doing it's final run do the holes appear. Anybody got any ideas why this is happening or how to solve it? Thanks Deri (tearing his hair out!) Link to comment Share on other sites More sharing options...
derijones Posted May 23, 2005 Author Share Posted May 23, 2005 Another view - Link to comment Share on other sites More sharing options...
J.R. Posted May 23, 2005 Share Posted May 23, 2005 It could be a material problem. i have these problems in max using the raytrace material, sometimes even with the standard material. i solved it using the DGS-Material even for plain diffuse materials... Link to comment Share on other sites More sharing options...
derijones Posted May 23, 2005 Author Share Posted May 23, 2005 Thanks - I'll try that. I'm using Photoshop texture file nodes for convenience (does MAX have that? - colour, bump etc on different layers - very handy!) and I wonder if that might be a cause - I rendered the second example again later and it came through without a problem..... Thanks again Deri Link to comment Share on other sites More sharing options...
mohamedberry Posted June 20, 2005 Share Posted June 20, 2005 Hey... i had the exact problem and it turned out to be caused by wrong saved GI values, so all you'll have to do is to restart & regenerate your GI Link to comment Share on other sites More sharing options...
enigma Posted June 23, 2005 Share Posted June 23, 2005 some say its the material that causes the prob, for some its the render settings, as for me, i say its the mesh...try to convert everything into an editable poly, let's see. it happened to me, i tried everything, but turning it into a poly worked for me. Link to comment Share on other sites More sharing options...
nisus Posted June 30, 2005 Share Posted June 30, 2005 My guess is that you use architectural materials??? Change to standard nisus Link to comment Share on other sites More sharing options...
William Alexander Posted June 30, 2005 Share Posted June 30, 2005 WOW!!! That's extreme LOL Up the sampling, and make the sampling area smaller. I'd check the Hdri for very dark areas and the area light settings-as those maybe 'sampled' to low also. I've never seen mental ray, without GI photons produce anything so dark and well defined. WDA Link to comment Share on other sites More sharing options...
bcampbell Posted July 4, 2005 Share Posted July 4, 2005 I am suffering the same right now. I am wondering if this is the 'flag as black' option for illegal video color? Link to comment Share on other sites More sharing options...
nisus Posted July 4, 2005 Share Posted July 4, 2005 NO! It's a material error! --> Standard! nisus Link to comment Share on other sites More sharing options...
William Alexander Posted July 5, 2005 Share Posted July 5, 2005 NO! It's a material error! --> Standard! nisus Hey Nisus, It's textured in MAYA...no arch materials , just all the nromal menta ray oddities IMHO WDA Link to comment Share on other sites More sharing options...
nisus Posted July 5, 2005 Share Posted July 5, 2005 Bloody Hell?? Let me know if anyone found an answer... What has been tried to solve it? - additional RAM? - other materials? - other type of material? - different type of lighting? - more rays? more photons? higher FG? - Raytrace Depth? - Perfume? - Killer Rabbit? - Vanessa Fembot? nisus Link to comment Share on other sites More sharing options...
vertexART Posted July 5, 2005 Share Posted July 5, 2005 My bet, cause it happened to me also, is geometry fault. Do like Enigma said, convert to poly and weld vertices!! Hope it helps. Link to comment Share on other sites More sharing options...
bcampbell Posted July 5, 2005 Share Posted July 5, 2005 The more and more different answers I see make it look like a memory bug to me. I bet if I consolidate modifier stacks and trim down some textures the black spots go away - will let you all know in 30 mins. Scene Stats Objects: 85 Faces: 397333 Memory Used: P:909.6M V:941.3M Lights: 6 Shadow Mapped:0 Ray Traced:1 Link to comment Share on other sites More sharing options...
bcampbell Posted July 5, 2005 Share Posted July 5, 2005 Scene Stats Objects: 75 Faces: 396782 Memory Used: P:576.0M V:587.7M Lights: 6 Shadow Mapped:0 Ray Traced:1 And no - it didn't fix a bl00dy thing! I hate mental ray - official! Link to comment Share on other sites More sharing options...
William Alexander Posted July 5, 2005 Share Posted July 5, 2005 I hate mental ray - official! What is the FG trace depth? You have 6 lights and only one casting shadows along with HDRI skydome, not a problem.... are the fill lights using any kind of attenuation or falloff? Link to comment Share on other sites More sharing options...
bcampbell Posted July 5, 2005 Share Posted July 5, 2005 no skydome and all was well untill an just over an hour ago. Bizarrley when i go backwards the black blobs are still there. All lights use inverse square Attenuation - 4 fill lights and one shadow caster IK'd to a daylight system that is turned off! At the moment I am welding vertices on all objects - lets see how I get on. Link to comment Share on other sites More sharing options...
William Alexander Posted July 5, 2005 Share Posted July 5, 2005 Are you solving a new FG solution for each view or caching? Are you using different cameras or default view/camera and pan/zooming for the renders? Link to comment Share on other sites More sharing options...
bcampbell Posted July 5, 2005 Share Posted July 5, 2005 I have deleted the fill lights and the blobs have gone. Mental Ray is a schizophrenic twisted cantankerous son of a female dog. Link to comment Share on other sites More sharing options...
bcampbell Posted July 5, 2005 Share Posted July 5, 2005 even with FG turned off they where there! Link to comment Share on other sites More sharing options...
vertexART Posted July 5, 2005 Share Posted July 5, 2005 Mental Ray is a schizophrenic twisted cantankerous son of a female dog. Well, that's why U have other options.. Assign a default mat to all objects and render. Have U tried that? Though I go with vertices problem again. Link to comment Share on other sites More sharing options...
enigma Posted July 6, 2005 Share Posted July 6, 2005 ey brian...you can try merging all of your objects into a new scene. if those black sons of a female dog are still there, convert everything into a poly. Backup ur file... Link to comment Share on other sites More sharing options...
William Alexander Posted July 6, 2005 Share Posted July 6, 2005 I have deleted the fill lights and the blobs have gone. Mental Ray is a schizophrenic twisted cantankerous son of a female dog. Yes it is..... but so is tuning a formula one car In your last post, with the fg turned off, where the fill lights on? If you want, strip the geometry from the scene, zip the file up and post it. I'd like to take a look see. If your running Mac export for PC, if possible. I've run into some situations where, in MR, having attunuated lights & no shadows causes 'black' to be added (for a lack of a better term-more like multiplied) to objects after the attenuation reaches 0 light intensity. But only when rendering with MR. WDA Link to comment Share on other sites More sharing options...
bcampbell Posted July 7, 2005 Share Posted July 7, 2005 I have converted everything to an editable mesh. I have split the scene into two and XRef'd them (just to see if it made a difference with the building in the scene or not). I have welded all vertices. I have redone the lighting - this time I have a skylight with HDRI and one raytrace drectional light. I have patched up my differences with God. I helped old ladies cross the road and I have forgiven others who have crossed me in the past. I have however found that if I DON'T specify a Maximum Sampling Radius the black blobs don't come back. However with my new GI settings Max does a 'fast exit' with FG enabled. Outta the frying pan into the fire or something to that effect. Link to comment Share on other sites More sharing options...
bcampbell Posted July 8, 2005 Share Posted July 8, 2005 Ok - today I uninstalled MAX and all plugins + GIMP and any other software that I thought may not fall under a common scenario for todays GC artist. I then reinstalled MAX - not reinstalling SP1 and RPC plugin. I used default settings and installed the latest Nvidia GFX driver. I got from archives an earliy verion of the file and tested on that an the blobs where still there. I altered my GI settings turning off max sampling radius and MAX again would fast exit with FG enabled. I turned on FG but with the samples turned down to just 8. I then multiplied by a factor of 8 until it crashed - I got to 48. I have sent this scene off to render. The next one will be a day to night animation. The only thing I aven't done is convert everything to mental ray materials - I will do and post if it works or not. Link to comment Share on other sites More sharing options...
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