How to get HairGuides* for feathers/fur



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 09/11/2012 at 10:30, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   R9.6+ 
    Platform:   Windows  ;   Mac OSX  ; 
    Language(s) :     C++  ;

    ---------
    Hi,

    I would appreciate some direction on how one goes about getting HairGuides* for feather and fur objects, if it is possible to do that.

    I find no mention of these objects in the docs, nor any defined name for them in ge_prepass.h. However, I know their IDs, and given the hair_grass.cpp example, I have found some degree of success by sending them op->Message(MSG_HAIR_GET_OBJECT_TYPE, HairPluginMessageData* ). Casting the filled HairPluginMessageData::data field to HairPluginObjectData*, I do find that there are calc_generate , add_generate , and calc_hair functions present. However, in attempting to actually call calc_generate on the object, I have not been successful in generating a valid HairGuides*.

    Taking for example a fur object, if I pass HAIR_GENERATE_PASS_BUILD, I do get a non-null HairGuides*, but it has only one guide with seven segments, and it crashes unpredictably later, for instance, when calling HairGuides::GetRootUV. If I pass HAIR_GENERATE_PASS_INIT, calc_generate itself crashes. Most likely, I am just not passing correct parameters to calc_generate ; doc and op seem self-explanatory, but I am not sure what the others expect to be passed.

    The context is code running inside of a Hierarchy run with BUILDFLAGS_EXTERNALRENDERER, and I would appreciate if one of the developers could please post some example of how this is supposed to be done (if it is possible to get HairGuides* for these objects, that is).

    Thanks,
    JD



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 16/11/2012 at 04:22, xxxxxxxx wrote:

    Just bumping this, please let me know if there is something wrong with the question.



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 16/11/2012 at 05:52, xxxxxxxx wrote:

    I'm currently looking into this. I'll come back to you ASAP.



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 16/11/2012 at 07:27, xxxxxxxx wrote:

    Thanks, I appreciate it. Please don't feel the need to hurry, though, if it is possible to get guides for these objects, it should take little time for me to augment my current hair code to accommodate them.



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 06/12/2012 at 03:15, xxxxxxxx wrote:

    Hi,

    I got information on this from the developers.
    Feathers and fur objects use the hair API but invoking it in reverse is not supported. You could fake the hair calls to those objects but it was not intended to be used backwards.



  • THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

    On 06/12/2012 at 03:39, xxxxxxxx wrote:

    Thanks for getting that info.


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