ChannelShader acessing object attributes?

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On 21/09/2008 at 19:17, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   10.1 
Platform:   Windows  ; Mac  ;  
Language(s) :     C++  ;

---------
Hi, me again ;-)

I want a channelshader to get access to the object it's attached to (yes I read this thread).

Using a plugin object, I have written some values in the objects' container. Like this:

> obj->GetDataInstance()->SetReal(OBJ_MYSECRETOFFSET, Offset);

In the ChannelShader, I try to retrieve the values like this:

> Vector MyFunnyChannelshader::Output(PluginShader \*chn, ChannelData \*cd) \> { \>      RayObject \*robj = NULL; \>      BaseObject \*op; \>      LONG local_id = 0; \>      robj = cd->vd->ID_to_Obj(cd->vd->lhit, &local;\_id); \>      op = robj->link; \> \>      // Print object's name and the stored value \>      GePrint(op->GetName() + ": " + RealToString(op->GetDataInstance()->GetReal(OBJ_MYSECRETOFFSET, 0.0))); \> \>      return Vector(1.0, 0.0, 1.0); // Return some dummy color \> }

The object's name is printed out fine while rendering, but the retrieved value is always 0. Also, the "op" pointer in MyFunnyChannelshader::Output points to different addresses than the "obj" pointer in the first code. It seems, all objects are copied for rendering; even when rendering in the editor?

This is my first approach to a channel shader, so go easy on me ;-)
I'd be happy about any tips or hints. How can I put values into the objects that I can retrieve in my shader?

Greetings,
Jack

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On 22/09/2008 at 05:46, xxxxxxxx wrote:

What you get in the volume data is the polygonal cache object of the original object. You have to use GetCacheparent to retrieve the original object. Something like this:

> \> if(cd->vd) \> { \>      RayObject \*robj = NULL; \>      LONG local_id = 0; \>      robj = cd->vd->ID_to_Obj(cd->vd->lhit, &local;\_id); \> \>      if(robj && robj->link) \>      { \>           BaseObject \*op = NULL; \>           op = robj->link->GetCacheParent(); \> \>           if(op) \>           { \>                BaseContainer \*data = NULL; \>                data = op->GetDataInstance(); \>                //do something here \>           } \>      } \> } \>

cheers,
Matthias

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On 22/09/2008 at 07:03, xxxxxxxx wrote:

Very super, that works perfectly for me!
Many thanks, Matthias!

Greetings,
Jack

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On 25/09/2008 at 04:45, xxxxxxxx wrote:

I just encounter a problem. This only works with primitives, as it seems.

When I have cube primitives, the memory address of "op" in the shader (code is exactly as you postet it above) is the address of the cube primitive I wrote the data into. Working.

But when I use polygon objects, the address of "op" in the shader is another one. Of course, the data I had written in the polygon object can not be retrieved, since "op" in the shader seems to point to another object.

What can I do?

+ + +

2nd question:
How can I make your code work with sphere primitives that have the option "Render perfect" enabled?

Greetings,
Jack

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On 25/09/2008 at 04:56, xxxxxxxx wrote:

Ah, OK, got it working. The data is then hosted in ->link and not in ->link->GetCacheParent().

Anyway, my question about the 'perfect sphere' remains. How can this be done?

Greetings,
Jack

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On 25/09/2008 at 16:02, xxxxxxxx wrote:

Oops, this is suddenly working now, too.

Didn't debug it yet, but I guess when using perfect spheres the data is also contained in "link" and not in "cacheparent".

Close this thread, I'm just mumbling to myself...

Greetings,
Jack

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On 21/05/2009 at 10:56, xxxxxxxx wrote:

Just have to push this old thread up again...

When the rendered object is an instance object, using the code from this thread I always get access to the container of the original instanced object. How can I detect if the rendered object is an instance object, and then access the instance object's container?

Also, instead of the old code:

> <code>robj = xvd->ID_to_Obj(xvd->lhit, &local;_id);</code>

...I now use this:

> <code>robj = xvd->op;</code>

Seems to be exactly the same, didn't notice any difference. So why use ID_to_Obj()?

Anyway, the instance is the most important for me now ;-)

Thanks in advance for information!

Greetings,
Jack

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On 22/05/2009 at 15:02, xxxxxxxx wrote:

Does anybody have an idea?

Let's summarize (code stripped down to the essential parts) :

> \> Vector MyShader::Output(PluginShader \*chn, ChannelData \*cd) \> { \>      // Get volume data \>      VolumeData \*xvd = cd->vd; \> \>      // Get Ray object \>      RayObject \*robj = xvd->op; \> \>      // Get polygon cache \>      BaseObject \*pcache = robj->link; \> \>      // Container \>      BaseContainer \*dsource = NULL; \> \>      // Check if this object contains values for my shader \>      // (Check for Bool value that I write in all objects that should be shaded) \>      if (pcache->GetDataInstance()->GetBool(THIS_OBJ_IS_SHADED)) { \>           dsource = pcache->GetDataInstance(); \>      } \>      else { \>           dsource = pcache->GetCacheParent()->GetDataInstance(); \>      } \> \>      // Color calculations start here \>      // and read values from the object like this: \>      Real Value = dsource->GetReal(SOME_ID, 0.0); \> \>      // ... \>      // ... \>      // ... \>      return my_color_value; \> } \>

That works with all kind of objects, polygon objects, generators, perfect spheres, etc. But not with Instance objects. If I have an instance of an object, pcache always represents the linked original object instead of the instance object.

How can I detect if the rendered object is an instance object? I am sure there is a way.

Thanks for tips!

Cheers,
Jack

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On 26/05/2009 at 03:25, xxxxxxxx wrote:

You have to go up all the cache hierarchy not just one step. Here some working code:

> \> Vector MandelbrotData::Output(PluginShader \*chn, ChannelData \*cd) \> { \>      if (cd->vd) \>      { \>           RayObject \*robj = NULL; \>           robj = cd->vd->op; \>           if (!robj) return 0.0; \> \>           BaseObject \*parent = NULL; \>           BaseObject \*op = NULL; \>           op = robj->link; \> \>           while (op) \>           { \>                parent = op; \>                op = op->GetCacheParent(); \>           } \> \>           if (parent && parent->GetType() == Oinstance) return Vector(1.0, 0.0, 0.0); \>      } \> \>      return 1.0; \> } \>

cheers,
Matthias

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On 26/05/2009 at 04:03, xxxxxxxx wrote:

Ah, yes!

Thanks Matthias. I've been searching for this soooo long. Please excuse my offensive grizzling. Things can be so frustrating when one doesn't know the answer.

Again, thanks a thousand times! As always, you're going to be credited in my plugin's manual ;-)

Cheers,
Jack

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On 27/05/2009 at 05:16, xxxxxxxx wrote:

Hm, sorry to bug you again with this, but it does not work.

Instead of returning white (like in your example), I print a message to the console:

> <code>
> if (parent && parent->GetType() == Oinstance)
>     GePrint("Instance!");
> </code>

The message IS printed.

But the problem is, when I try to get the Instance object's Container like this:

> BaseContainer \*data = parent->GetDataInstance();

I always get a pointer to the same memory address, no matter which of the hundreds of instance objects is being rendered.
Is this the container of the original object instead of the instance object's container?

Any more ideas?

Greetings,
Jack

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On 27/05/2009 at 05:26, xxxxxxxx wrote:

I have no idea why it is not working for you. It works perfectly fine here. Have you tried the exactly same code I posted? Maybe it's something else within your code?

cheers,
Matthias

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On 27/05/2009 at 05:30, xxxxxxxx wrote:

Sorry, I altered my previous post.
It works, but not as expected. Please refresh the page, and read again. Sorry ;-)

Cheers,
Jack

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On 27/05/2009 at 06:30, xxxxxxxx wrote:

Sorry I can not confirm this. This code is working fine for me:

> \> Vector MandelbrotData::Output(PluginShader \*chn, ChannelData \*cd) \> { \>      if (cd->vd) \>      { \>           RayObject \*robj = NULL; \>           robj = cd->vd->op; \>           if (!robj) return 0.0; \> \>           BaseObject \*parent = NULL; \>           BaseObject \*op = NULL; \>           op = robj->link; \> \>           while (op) \>           { \>                parent = op; \>                op = op->GetCacheParent(); \>           } \> \>           if (parent/\* && parent->GetType() == Oinstance\*/) \>           { \>                BaseContainer \*data = NULL; \>                data = parent->GetDataInstance(); \> \>                GePrint(LongToString((LONG)data)); //print the address of the container \>                 \>                //return Vector(1.0, 0.0, 0.0); \>           } \>      } \> \>      return 1.0; \> } \>

cheers,
Matthias

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On 27/05/2009 at 10:36, xxxxxxxx wrote:

Ah, ok, it seems I did something wrong.
Works not with normal objects, Ray objects (like the perfect sphere) and Instance objects. Thanks a lot!

Cheers,
Jack

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On 30/05/2009 at 14:04, xxxxxxxx wrote:

Hi there, may I jump in here with my following question?
I have a shader where I just use the object position to define a color. It works perfect until I use a generator plugin - than the shader just uses the position of the child object but not of the cloned objects.

Can you give me a hint where to look?

thanks in advance,
cheers,
Ello

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On 30/05/2009 at 14:36, xxxxxxxx wrote:

hm.seems it just works when the child object is a polygonobject