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Solution!
I know this is a slightly old thread, but just in case anyone has still been having trouble with the irradiance map prepass I have stumbled upon the solution whilst returning to experimenting. Quite simply, it's to do with the Sample Lookup type and the Calc. Pass Interpolation Samples in the 'Animation (Prepass)' menu.
On the version I was using the default Sample Lookup method was set to 'Overlapping', which will create the splotches unless the Interpolation Samples are set to ~30 (which is as high as they will go). So to fix the problem all you have to do is either turn up the Interpolation Samples or change the Sample Lookup type to anything other than 'Overlapping'. (I would highly recommend 'Density Based').
I would read the V-Ray documentation to help you decide which method to use (http://help.chaosgroup.com/vray/help...vancedimap.htm), though for most cases 'Density Based' is the best.
Staying with Overlapping and turning up the Interpolation Samples will give you a smoother result, but it does seem to be a slightly more 'hackish' method than using 'Density Based' instead, but with 'Density Based' you might need more H-Subdivs. These settings can also be changed after the Irradiance Maps have been generated as they seem to just tell V-Ray how to use the precomputed data, so you can just experiment with the settings a bit until you are happy with the result without having to prepass the Irradiance Maps again. However if you want to change the settings you will need to jump back and forth between the 'Animation (Prepass)' and 'Animation (Rendering)' Menus as the settings are in the 'Animation (Prepass) menu.
P.S. I think 'Density Based' is now the default Sample Lookup method in the newest versions of the plugin now, so you probably don't even have to touch those settings anymore.
I know this is a slightly old thread, but just in case anyone has still been having trouble with the irradiance map prepass I have stumbled upon the solution whilst returning to experimenting. Quite simply, it's to do with the Sample Lookup type and the Calc. Pass Interpolation Samples in the 'Animation (Prepass)' menu.
On the version I was using the default Sample Lookup method was set to 'Overlapping', which will create the splotches unless the Interpolation Samples are set to ~30 (which is as high as they will go). So to fix the problem all you have to do is either turn up the Interpolation Samples or change the Sample Lookup type to anything other than 'Overlapping'. (I would highly recommend 'Density Based').
I would read the V-Ray documentation to help you decide which method to use (http://help.chaosgroup.com/vray/help...vancedimap.htm), though for most cases 'Density Based' is the best.
Staying with Overlapping and turning up the Interpolation Samples will give you a smoother result, but it does seem to be a slightly more 'hackish' method than using 'Density Based' instead, but with 'Density Based' you might need more H-Subdivs. These settings can also be changed after the Irradiance Maps have been generated as they seem to just tell V-Ray how to use the precomputed data, so you can just experiment with the settings a bit until you are happy with the result without having to prepass the Irradiance Maps again. However if you want to change the settings you will need to jump back and forth between the 'Animation (Prepass)' and 'Animation (Rendering)' Menus as the settings are in the 'Animation (Prepass) menu.
P.S. I think 'Density Based' is now the default Sample Lookup method in the newest versions of the plugin now, so you probably don't even have to touch those settings anymore.
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