Loading IES Files into Light Objects?



  • On 16/10/2015 at 15:44, xxxxxxxx wrote:

    Hi,

    I'm attempting to write a SceneLoaderData plugin for IES files that automatically adds them as new light objects to the scene. I'm able to successfully create a light object, set it's type to Photometric, and load in the IES file, however loading the IES file programmatically doesn't auto-fill the Photometric Intensity and Luminaire information as happens when you manually load the IES file in C4D.

    Here's the code I'm using to load the IES files into a new light:

      
            light = c4d.BaseObject(c4d.Olight)   
            light_bc = light.GetDataInstance()   
            doc.InsertObject(light)   
            light[c4d.LIGHT_TYPE] = c4d.LIGHT_TYPE_PHOTOMETRIC   
            light[c4d.LIGHT_PHOTOMETRIC_DATA] = True   
            light_bc.SetFilename(c4d.LIGHT_PHOTOMETRIC_FILE, name)   
    

    I'd rather not write my own IES parser to get at this information. Any recommendations on how to get C4D to auto-extract the info from the IES file?

    When C4D does it:

    When I do it:

    Thanks,

    Donovan



  • On 16/10/2015 at 22:18, xxxxxxxx wrote:

    Hello
    I only get preview by set levels

    http://imhocloud.com/image/7yeQ



  • On 19/10/2015 at 04:41, xxxxxxxx wrote:

    Hi Donovan,

    for internal reasons you need to use SetParameter() with DESCFLAGS_SET_USERINTERACTION flag to set the IES filename.
    Like so:

    light.SetParameter(c4d.LIGHT_PHOTOMETRIC_FILE, iesFile, c4d.DESCFLAGS_SET_USERINTERACTION)
    


  • On 19/10/2015 at 05:31, xxxxxxxx wrote:

    Originally posted by xxxxxxxx

    for internal reasons you need to use SetParameter() with DESCFLAGS_SET_USERINTERACTION flag to set the IES filename.
    Like so:

    light.SetParameter(c4d.LIGHT_PHOTOMETRIC_FILE, iesFile, c4d.DESCFLAGS_SET_USERINTERACTION)
    

    I can't resist to thank you.
    Some time ago i used it but with _c4d.DESCFLAGS_SET_0

    _ Interesting, does it need to update c4d/AM after set parameter _, by c4d.SendCoreMessage(c4d.COREMSG_CINEMA, c4d.BaseContainer(c4d.COREMSG_CINEMA_FORCE_AM_UPDATE))
    _



  • On 19/10/2015 at 09:04, xxxxxxxx wrote:

    @Andreas - Thanks so much, that did the trick! Is there any rule of thumb for when I should use "SetParameter" over one of the other methods like SetFilename or the more simple "light[c4d.LIGHT_PHOTOMETRIC_FILE] = file"?

    Here's the code I'm using now:

      
            light = c4d.BaseObject(c4d.Olight)   
            ies_file_name = os.path.splitext(os.path.basename(name))[0]   
            light.SetName("IES Light: " + ies_file_name);   
            doc.InsertObject(light)   
            light[c4d.LIGHT_TYPE] = c4d.LIGHT_TYPE_PHOTOMETRIC   
            light.SetParameter(c4d.LIGHT_PHOTOMETRIC_FILE, name, c4d.DESCFLAGS_SET_USERINTERACTION)   
            light.Message(c4d.MSG_CHANGE)   
    


  • On 19/10/2015 at 09:05, xxxxxxxx wrote:

    Also, thank you @Ilya for your help as well!



  • On 19/10/2015 at 09:11, xxxxxxxx wrote:

    Hi Donovan,

    well, the rule of thumb is, you should always prefer SetParameter() or in Python the equivalent obj[descid] over accessing the BaseContainer directly (GetDataInstance(), bc[id]), because in the later case you somewhat bypass the object, which can not react on the parameter modification (in its SetDParameter() function). And not every object stores everything in the BaseContainer, then of course the container access fails completely. See also the thread Set light intensity from Python.

    In your case, you have to use SetParameter() instead of obj[] in order to pass the user interaction flag, of course.



  • On 20/10/2015 at 17:02, xxxxxxxx wrote:

    I started with the __get__ / __set__ methods, but didn't get the result I was after, at which point I moved to GetDataInstance(). Thanks for more context, that gives me a better sense of how to approach this in the future.


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