VO1D Posted July 31, 2018 Report Share Posted July 31, 2018 In the source code of RTI viewer, I found the following formula to calculate the normal of each pixel from the 6 coefficients: Where does it derive from? Does any paper or book mention this topic? Quote Link to comment Share on other sites More sharing options...

gianpaolo Posted July 31, 2018 Report Share Posted July 31, 2018 It is simply the stationary point of the paraboloid described by the 6 coefficients. The formula is described in the original PTM paper: http://www.hpl.hp.com/research/ptm/papers/ptm.pdf 1 Quote Link to comment Share on other sites More sharing options...

VO1D Posted July 31, 2018 Author Report Share Posted July 31, 2018 39 minutes ago, gianpaolo said: It is simply the stationary point of the paraboloid described by the 6 coefficients. The formula is described in the original PTM paper: http://www.hpl.hp.com/research/ptm/papers/ptm.pdf Thanks a lot, it solves my problem. Quote Link to comment Share on other sites More sharing options...

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