Notifications
Clear all

[Closed] DUVW derivatives in ShadeContext class

 
 relief7
Sep 15, 2010 6:27 am

Hi,

                 I am currently developing a new camera map plugin for 3ds max.

http://www.projectgemini.net/CameraMapGemini/ 

                   To be able to implement a new feature I am trying to understand what the DUVW method in  the ShadeContext class does. But there is almost no information about it  in the help manual. Usually in derivates you have the                       change of one variable relative to another. Let’s  say dU/dP. But in the max reference this second variable isn’t  specified. Is it change of UVW in relation to screen space ? Or                       world space ?                     

                                        Furthermore I am interested how a map is able to  calculate these derivatives. What is needed ? In my case I cannot use  uvGen so I need to be able to calculate them myself.                     

                                        I will be delighted if anyone can help me out !                     

                                        Thanks,
                   Markus