Search the Community
Showing results for tags 'Hsh'.
Found 3 results
Errors in Processing both HSH and PTM RTI
Luke posted a topic in Processing RTI DataDear All, Thank you for taking the time to read this. I am attempting to create RTI's for my masters thesis, and am coming across the same error messages regardless of what I do. Both HSH and PTM have the same error messages (With the name swapped per method) that pop up in sequence 1 through to 3. I've attached images of the error pop-ups. I have created both HSH and PTM on this PC without issue before, and not moved where either of the fitters are, or the files used, but for some reason I can no longer create RTI. I am running a Windows 10 64bit OS, with AMD Ryzen 7 2700X Processor and 16GB RAM. I've checked the file pathways and dont see any spaces or things to cause issue - but have copied the file pathways below: L:\Diss_Images\A_Relief_RTI_img (There is then the jpeg-exports folder within) C:\RTIbuilder_v2_0_2 C:\RTIbuilder_v2_0_2\Fitters (Both PTM and HSH fitters are stored here.) If there's any more information I can provide that would help diagnose this issue please ask. Thanks in advance, Luke
Determining Normals for HSH
Michael posted a topic in Processing RTI DataAfter the coefficients are found for Hemispherical Harmonics, how does RTIBuilder determine the direction of the surface normal? Does the program assume the surface is diffuse and look for the maximal lighting direction? I have seen multiple articles (Manfredi et. al.) that state that HSH more precisely determines surface normal direction, but neither those articles nor their references seem to point to how the surface normals are actually calculated. Unlike PTM, there are potentially multiple places where the gradient could be zero and with 16 coefficients, those locations are not easily solved for. Thanks for any assistance!
Creating a 3th order HSH
FienMessens posted a topic in Processing RTI DataDear all I'm trying to create a 3th order HSH (16 variables) with RTIBuilder on my Mac. But every time when I execute the program I get a RTI file from the second order (9 variables) or even from the first order (4 variables), although the order is set on "3". Does anyone have an idea how I can solve this? Thanks in advance!