CinnamonMetal Posted December 1, 2018 Share Posted December 1, 2018 How do you measure the length of a displacement or bump / normal in any metric unit of measurement ? Quote Link to comment Share on other sites More sharing options...
LaidlawFX Posted December 2, 2018 Share Posted December 2, 2018 You can use the length vop from the original surface to the displaced surface and export to an image plane. If you have not changed scene scale, and your model is to correct units, the displacement should be in meters. 1 Quote Link to comment Share on other sites More sharing options...
CinnamonMetal Posted December 2, 2018 Author Share Posted December 2, 2018 @LaidlawFX How can you check that scene scale and that the model is to correct units ? Are you talking about modeling to scale ? Quote Link to comment Share on other sites More sharing options...
Jesper Rahlff Posted December 3, 2018 Share Posted December 3, 2018 if you go to Edit > preferences > hip file options, you can check if your units are set to 1 meter and 1 kg. (this is standard for houdini). Then IF you modelled to real world scale you will get accurate values in meters as described above by LaidlawFX 2 Quote Link to comment Share on other sites More sharing options...
LaidlawFX Posted December 3, 2018 Share Posted December 3, 2018 In addition to what Jesper said, even if you don't model to scale, but know the relative conversion ratio of your model the value should be correct. For example, if you are taking terrain data and scaling a mountain to the correct size, you can not do it at real world scale due to precision issue of 32/64 bit precision, however, you can scale your object by a percent and be good enough for CG. Quote Link to comment Share on other sites More sharing options...
CinnamonMetal Posted December 3, 2018 Author Share Posted December 3, 2018 I assume 1 meter is one unit within Houdini ? Is it possible to know the real world scale of a mountain ? Quote Link to comment Share on other sites More sharing options...
LaidlawFX Posted December 4, 2018 Share Posted December 4, 2018 https://en.wikipedia.org/wiki/Topographic_map Quote Link to comment Share on other sites More sharing options...
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