Hi!
In my renderer plugin, I use the following code to get the camera FOV:

Float aperture = camera->GetAperture();
Float focus = camera->GetFocus();
float horizontal_fov = (float)RadToDeg(2 * ATan(0.5*aperture / focus));

This matches perfectly when rendering to the picture viewer, but when I render to the viewport there is a slight mismatch in the camera FOV.

Any suggestions on how to get the correct camera field of view for viewport rendering?

(I should add that I am determining render resolution by the size of the buffers obtained in the renderer videopost, like this:

VPBuffer* colorBuf = vps->render->GetBuffer(VPBUFFER_RGBA, NOTOK);

maxon::Int32 const xres = colorBuf->GetInfo(VPGETINFO::XRESOLUTION);
maxon::Int32 const yres = colorBuf->GetInfo(VPGETINFO::YRESOLUTION);

)

"I warmly recommend cloning the whole document on a temp doc"
Thanks, I'll try working on a clone. I had the impression that the document passed to the videopost was already a clone of the original document, but perhaps this is not the case for viewport rendering?

"With regard to your issue, I'm a bit confused by the need you have to call BaseDocument::AnimateObject() or BaseDocument::ExecutePasses() when the VIDEOPOSTCALL in VideoPostData::Execute() is VIDEOPOSTCALL::INNER. Actually when you're in this step, you can already access and query the VolumeData to retrieve all the relevant information about the scene elements (like RayObject, RayLight and so on)."

-We have some good reasons for working with the basedocument directly, rather than the data provided from the VolumeData.

"Consider that this approach is sub-optimal since you're going to double the resources used to store the current document."
-OK. This should be fine for our purposes. Our plugin actually provides custom rendering commands, that are the preferred way of rendering with the plugin. The videopost functionality is added as more of a convenience in our case, to make the plugin work nicely with things like viewport rendering, material preview etc.

/Filip

Hi!
I am writing a custom renderer, implemented as a videopost plugin. In the execute() function of the videpost, during VIDEOPOSTCALL::INNER, I traverse the document obtained from vps->doc to extract the scene information (geometry, shaders, lights, etc. ) that gets sent to the API of the renderer.

All works fine when I render to the picture viewer, but when I try to do viewport rendering I get crashes.

During the traversal, I do in some cases perform some operations on the parsed document, such as AnimateDocument(), ExecutePasses() etc. I am thinking that one of these might be the culprit. So, here is my somewhat vague question: Are there any operations that are forbidden to perform on vps->doc during viewport rendering? (But are allowed during picture viewer rendering)

Thanks!
/Filip

@s_bach OK, thanks!

@s_bach said in Node Editor API for R21?:

Hello,

your assessment is correct. The Cinema 4D R21 SDK does not provide an API to edit node materials.

best wishes,
Sebastian

Are there possibly any functions for traversing existing node graphs?

/Filip

@m_magalhaes said in Safety of GetCache() after ExecutePasses()?:

The scene will be update and you can retrieves the caches.

Great, thanks!

/Filip

@m_magalhaes

"when you are using RenderDocument, you can set the RENDERFLAGS, so it can be virtually "anything""
-Yes, that makes sense. Thanks.

"Can i ask you why you need to know if a render have been started using the RenderDocument() function ?"
-In a custom renderer, I am exploring the possibility of sometimes (depending on user selected options) sending the rendered images to an external image viewer (not the c4d picture viewer). In this case, if RenderDocument() is called, we would still want to render to the c4d bitmap to make sure RenderDocument() correctly returns an image.

Anyway, as I said, this was a bit of a long shot. Since this appears not to be possible, I will explore other options.

Thanks!
/Filip

Hi all!
I am implementing a recursive traversal of a scene, visiting all real and virtual objects in the hierarchy, closely following the recursive function outlined in the documentation of BaseObject::GetCache().

The docs also say this about safety: "Use the above routine only if the caches are already built. It is for instance not safe to use it in a command plugin since the user can have stopped the scene redraw and the building of caches."

Is it safe to call this routine if I have built the caches myself using ExecutePasses(), even if called from a command plugin?

/Filip

Hi!
This might be a long shot: Is there any way to detect, from a videopost plugin, is a render was started by a call to RenderDocument(), i.e., are there any special flags set that indicate this?

Thanks
/Filip

Hi again,
It turns out that the issue was not related to Cinema 4d itself, but was caused by how I handled the connection to the 3rd party library. You can mark this as solved.

Best regards
/Filip