Melange data on Display Tags [SOLVED]

On 14/06/2016 at 11:20, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   16 
Platform:      Mac OSX  ; 
Language(s) :     C++  ;

I've just been getting started diving into Melange, and the first problem I've encountered is that getting parameters from a Display Tag returns incorrect data. It seems to return the default state of the tag data rather than any changes made in the file.

My file consists of a single cube with a display tag on it with Visibility toggled on, and set to 69%, and Textures toggled off. The Use option for both Visibility and Textures is also toggled on.

if (tag->GetType() == Tdisplay) {
    if (tag->GetParameter(DISPLAYTAG_AFFECT_VISIBILITY, data)) {
        if ((bool)data.GetBool()) {
            printf("\n   \+ Visibility Active = true");
        } else {
            printf("\n   \+ Visibility Active = false");
    if (tag->GetParameter(DISPLAYTAG_VISIBILITY, data) && data.GetFloat()) {
        printf("\n   \+ Visibility = %f", data.GetFloat());
    if (tag->GetDParameter(DISPLAYTAG_TEXTURES, data)) {
        if ((bool)data.GetBool()) {
            printf("\n   \+ Textures = true");
        } else {
            printf("\n   \+ Textures = false");

this prints out:

  \+ Visibility Active = false
  \+ Visibility = 1.000000
  \+ Textures = true

This result does not reflect the actual file, which should have visibility active set to true, with a value of 69.0, and textures set to false.

However, if I get the parameters of the phong tag, or I add a compositing tag and make adjustments, both of those return accurate data, so I'm confident my parameter requesting code is not the problem.

On 14/06/2016 at 13:06, xxxxxxxx wrote:

for what it's worth, the only display tag parameter that appears to be accurate is DISPLAYTAG_SDISPLAYMODE, all other parameters report the same default values that are in place when the tag is first created, regardless of what the actual saved values are.

On 15/06/2016 at 03:13, xxxxxxxx wrote:


this seems like a bug in the Melange library. Thanks for reporting this, a bug report was filed.

An alternative to accessing a parameter using GetParameter() is to access the data stored in the BaseContainer. It seems that the data stored in the BaseContainer is correct:

BaseContainer bc = tag->GetData();  
const Bool affectVisibilityFromBC = bc.GetBool(DISPLAYTAG_AFFECT_VISIBILITY);  
  printf("affect Visibility\n");  
  const Float visiblity = bc.GetFloat(DISPLAYTAG_VISIBILITY);  
  printf("Visibility = %f \n", visiblity);  

Best wishes,

On 16/06/2016 at 09:49, xxxxxxxx wrote:

Great, thanks so much! I'll give this code a try shortly. I also tried to file a bug report myself via the [email protected] email that is listed on the About page, but it got bounced back, saying that address doesn't exist.

On 17/06/2016 at 01:28, xxxxxxxx wrote:


we are terribly sorry about the wrong email address. We originally planned to have a dedicated email address, then dumped that idea and completely forgot to change the About page. :angry:
Thanks for pointing it out. The About page got corrected.
In short: For bug reports either use the Bug Report subforum here in Plugin Café or send a mail to our usual address [email protected].
Sorry for any inconvenience caused.