warrenwest Posted December 13, 2016 Share Posted December 13, 2016 This one for all the ray trace experts out there. I have been practicing for a while now and I was running a test today of a whiskey glass containing ice cubes. After about 36 passes I got to this stage below. Will this 'noise' clear up if I let it run all night or will I have to change the settings? Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 14, 2016 Share Posted December 14, 2016 It is very difficult to predict how much this will clean up by running significantly more passes. How long did it take to run 36 passes? Try 100 passes and see if there is a noticeable improvement, this would provide some indication as to how long it might take to fully clear up. How you have lite this will also effect the degree of speckles in combination with the material settings. Raytracing through multiple layers of glass and transparent materials is a real challenge. Suggest posting the plan to see what others might come up with. Graham Link to comment Share on other sites More sharing options...
ericepv Posted December 14, 2016 Share Posted December 14, 2016 Without seeing your settings I can only offer advice based on my past experience. Be sure to have plenty of added light (and keep ambient light to a minimum), I would add a light source that is set as a Point Light.. Also, use Photon Mapping & Caustics for the best quality of image. Eric Link to comment Share on other sites More sharing options...
KirkClemons Posted December 14, 2016 Share Posted December 14, 2016 I typically need to run a ray trace for close to 100 passes or more when using caustics. It will eventually clear up it's just an expensive process. Link to comment Share on other sites More sharing options...
warrenwest Posted December 14, 2016 Author Share Posted December 14, 2016 HI Guys and thanks for the feedback so far. I have pretty much everything set like you suggested the only difference being the number of passes. I will run this overnight and report back in the morning Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 14, 2016 Share Posted December 14, 2016 You should not have to run this all night. Here is one I just ran with 10 passes in 12 minutes. Photon mapping "ON", Caustics "ON", 1200px x 1200px. Scene uses only two spot lights. Graham Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 14, 2016 Share Posted December 14, 2016 Here is the same scene with Photon Mapping & Caustics "OFF". 10 passes in 2 minutes. 1200px X 1200px. Here it is after only 3 passes in 40 seconds. No speckles. Graham Link to comment Share on other sites More sharing options...
warrenwest Posted December 14, 2016 Author Share Posted December 14, 2016 49 minutes ago, TheKitchenAbode said: Here is the same scene with Photon Mapping & Caustics "OFF". 10 passes in 2 minutes. 1200px X 1200px. Here it is after only 3 passes in 40 seconds. No speckles. Graham Thanks for the effort Graham. Perhaps its the model I'm using from 3Dwarehouse that is the problem? Would you be able to send me you whisky glass to test under the same circumstances and settings? Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 14, 2016 Share Posted December 14, 2016 The glass is just a standard glass and glass material in CA and the ice cubes are a resized pillow with the Crystal Ice Glass material form the CA material library, nothing special. It's more likely to be your lighting and Raytrace settings that are the issue. What you are dealing with is what happens when light is passing through several layers of semi-transparent material. The more layers the greater the potential for speckles. How bad or good this will be depends upon the amount of light, the type of light and the Raytrace settings. Unfortunately there is no single magic setting, these often need to be adjusted accordingly for each scene. The key is to try to gain an understanding as to what these settings really do so you have a means to access an issue and resolve it through a logical approach. Graham Link to comment Share on other sites More sharing options...
rlackore Posted December 15, 2016 Share Posted December 15, 2016 Graham, it appears there is no whiskey in your glass. Can you achieve the same raytrace results with a couple fingers of whiskey in the glass? Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 15, 2016 Share Posted December 15, 2016 20 minutes ago, rlackore said: Graham, it appears there is no whiskey in your glass. Can you achieve the same raytrace results with a couple fingers of whiskey in the glass? Sorry about that, it looked so real I downed it before the Raytrace was finished . Will pour another shot and give it a run. I do know that this will create more potential for speckles as it will add another layer of semi-transparent material that the light will need to pass through. Graham Link to comment Share on other sites More sharing options...
TheKitchenAbode Posted December 15, 2016 Share Posted December 15, 2016 Too early in the morning so I didn't drink this one. Ran this on my laptop so it's at a lower pixel size 600 X 600. No real problem with speckles, needs a bit of work, whiskey is not aged enough. Graham 1 Link to comment Share on other sites More sharing options...
KirkClemons Posted December 15, 2016 Share Posted December 15, 2016 Here's an example of using caustics:whiskey.bmp 100 passes took 40min. test-render.zip Link to comment Share on other sites More sharing options...
GeneDavis Posted December 15, 2016 Share Posted December 15, 2016 What is the secret for getting that close? I downloaded what looks to be the same glass with whiskey and ice that the OP has, and just put it into a blank plan, no table, no room, no lighting, nothing. How do you get the camera just a few inches away? And what transparency setting does one best use for the ice cube surface? Link to comment Share on other sites More sharing options...
KirkClemons Posted December 15, 2016 Share Posted December 15, 2016 Once the camera view is open select 3D> Camera View Options> Perspective Crop Mode. This will restrict the clipping plane to just the view port. I used the predefined material type of 'Transparent' and set the Index of refraction to Crown Glass. Link to comment Share on other sites More sharing options...
warrenwest Posted December 15, 2016 Author Share Posted December 15, 2016 I like where this is going folks Update, 10 passes around 7 mins Although now I have lost the definition around the base ! Link to comment Share on other sites More sharing options...
cjanderson66 Posted January 23, 2017 Share Posted January 23, 2017 Man, I'm getting thirsty. Must be 12 O'clock somewhere Link to comment Share on other sites More sharing options...
warrenwest Posted January 23, 2017 Author Share Posted January 23, 2017 2 hours ago, cjanderson66 said: Man, I'm getting thirsty. Must be 12 O'clock somewhere It's 23:00 where I am, cheers Link to comment Share on other sites More sharing options...
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