Cinema 4D Development

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  Read Before Posting
  general notes • • maxon

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  Rotate a bitmap image in portrait mode by 90 degrees
  r19 sdk microsoft windows api application development • • gogeta

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  Unsolved Reading console output - possible?
  python c++ r20 maxon api • • jwzegelaar

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  @a_block I'm sorry. I will in future. Question: can you direct me to an example of calling a c++ function from Python. This c++ could then get me the console output in Python.
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  Linking python tag userdata to null (ie compositing tag)
  • bencaires

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  Hi, The Test tag plugin is missing in the linked c4d file but I see the behavior with another tag plugin (Py-LookAtCamera SDK example). I was wrong in my previous post. This behavior of the Attribute Manager is applied to tags that can be added only once to an object. This can't be done for tags that can be added multiple times. Unfortunately the Python tag is registered with TAG_MULTIPLE flag so it can be added multiple times to an object but the parameter tab isn't attached to its parent object.
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  Controlling Shader with Userdata
  • bencaires

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  Hi Bencaires, I can confirm there is a bug in C4D when you drag and drop a user data parameter into the console from your scene, the wrong ID is written. With that's said if you open the User Data Manager (In the description of an object, in the top menu, User Data => Manage User Data ...). Select your User Data parameter then below the name/short name you get the actual ID of this parameter. So in your case, if you write the correct ID, your script is working nicely. import c4d def main(): ShaderOb = op[c4d.ID_USERDATA, 3] ShaderOp = op[c4d.ID_USERDATA, 10] ChannOp = op[c4d.ID_USERDATA, 2] ShaderOb[c4d.ID_MG_SHADER_SHADER] = op[c4d.ID_USERDATA, 10] ShaderOb[c4d.ID_MG_SHADER_CHANNELSELECT] = op[c4d.ID_USERDATA, 2] Cheers, Maxime.
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  Folder Structure Changes in R20
  c++ r20 issue plugin migration • • d_schmidt

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  Hello Daniel, thanks for reporting this. There are currently a few issues regarding the Plugins menu pending. These are being investigated. Cheers, Andreas
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  use python script change joint weight isn't update in viewport
  python classic api • • mike

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  @mike No need to apologize, we are all new here. No worries. Especially during the starting phase of this new forum, we try to point even at small issues, hoping it will lead to a cleaner forum in future.
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  Copy color of a clone to an other clone
  python solved classic api • • leo_ha

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  Hi, just a small request from our side: Please do not cross post to different forums (this topic on CGSociety). Chances are, you'll make people work for you redundantly. Cheers, Andreas
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  About threads
  c++ r20 maxon api • • anoano

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  Hello, there are a few issues with the code you posted. First, please make sure to use the correct function declarations. CommandData::Execute() is defined as Execute(BaseDocument* doc) The doc argument is a pointer, not a copy. Second, please pay attention to return values. The Execute() function must return a Bool value. The operator()() of the thread must return a maxon::Result<void>. In the Execute() function you create a thread instance. You must handle the error object returned by the Create() function. There are multiple ways to handle such error values. You find examples in the Error Handling manual. One way would be to use iferr_scope_handler. With that the Execute() function can look like this: Bool MenuTest::Execute(BaseDocument* doc) { iferr_scope_handler { err.DiagOutput(); err.DbgStop(); return true; }; if (!g_test) { g_test = MyThread::Create() iferr_return; } return true; } The worker function (operator()()) of the thread must return a Result<void> object. This is typically maxon::OK when everything is OK. You find an example of such a custom thread in the Threads Manual. Some more hints: for new code please use ApplicationOutput() instead of GePrint(). See API Transition. when posting code please use the Markdown syntax. See also Markdown summary. best wishes, Sebastian
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  How to use c4dpy for Cinema4D R20 SP1
  python r20 solved sdk project setup • • alfieB

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  Hello, we have updated the Python SDK documentation including c4dpy instructions. Let us know, if you are missing something in there. Cheers, Andreas
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  MAXON_MODULE_ID undeclared identifier [R20 C++ plugin]
  c++ r20 project tool project setup • • victor

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  Hello, just to make that clear: the Project Tool does not create *.hxx files. *.hxx files are created by the Source Processor during the build process. So you have to build or re-build your plugin to create these *.hxx files. best wishes, Sebastian
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  Multiplying (transforming) a Vector by a Matrix - in 3 or more steps...
  c++ r20 plugin migration api • • Keith Young

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  "actually, you can still multiply in one line. You just have to multiply a matrix with a vector:..." D'oh! I'm surprised that I didn't try that - tho it doesn't seem as intuitive ("vector = some other vector, being modified by some operations" vs. "vector = a matrix, imposing/operating on some vector", etc.)... do you know why the Vector lost so many direct operators (* other Vector (Dot()), * Matrix, % other Vector (Cross()) - there may be others)? Apparently, you can still '!v' to normalize it (yay), even tho there's a v.Normalize() call... and I can understand why the "Identity Matrix" operator might have changed from '!' to '~'... some of the other changes just seem a bit arbitrary. I've already made all the changes at this point, but thanks for the tip/reply - I'll keep that in mind for future reference. Cheers.
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  R20 Mac development
  c++ r20 sdk apple macos • • Keith Young

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  Thanks for the responses guys... I think I've found a virtual solution/work-around for the time-being. Cheers.
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  Priority confusion
  python r19 • • chuanzhen

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  I used the result of the skin of the 01 object, after using my own objectdata plugins, after the skin, using the poly matrix to constrain the joint of the object 02, the result is correct in the rendering window, but when I drag the time slider, The viewport sometimes has a delay, or I need to redraw it by pressing "A". How can I know how the interior of cinema 4d is calculated, although the above picture is my last thought, but this time the result seems to overturn my conclusion. Although I can know how to implement a constraint effect, how to calculate it with code, but always delay my theoretical calculation results in Cinema 4d. How does the Priority ? Deformer /Generator cache work, a mess!
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  R19: SplitPolygon and Ngon indices
  c++ r19 issue classic api • • fwilleke80

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  Hi Tim and Frank, thanks for writing here. With regard to the question initially raised by @fwilleke80, the issue is cause by the ngon index that should actually passed to the SplitCommand(). Whilst your code is correct and properly follow what's written in the documentation unfortunately doesn't reflect how internally the old modelling kernel works. Without entering the details of its design the code should be adapted in order to take in consideration both the count of ngon (> 4 points) and of polygons (3 or 4 points) and act accordingly as in code snippet below: ... Int32 ngonIdx = 0; Int32 pt1Idx = 4; Int32 pt2Idx = 7; const Int32 polyCnt = polyObj->GetPolygonCount(); const Int32 ngonCnt = polyObj->GetNgonCount(); if (ngonIdx < ngonCnt) ngonIdx += polyCnt; ... At the same time to replying to @Braeburn the ngon index values which are then shown in the UI are actually "polished" values without no offset leading to an evident confusion in external developers. Actions will be took to improve the documentation in this regard. For any further detail I also recommend to give a look at the Get Outer Edges thread where I wrote in the past about ngon representation and related methods. Best, Riccardo
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  Can't compile plugin on Mac OSX
  c++ r19 issue apple macos • • neon

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  Hi, difficult to tell. Is this already happening, just by adding the CUDA include paths to the project or do you actually need to include from the framework as well? Maybe there's something with the order of includes? Or something needs to be undefined again, after including CUDA somewhere? Just guess work, here at the SDK Team we have no experience with the CUDA framework at all. Cheers, Andreas
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  BaseContainer and Description
  classic api • • indexofrefraction

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  thank you sebastian, this is a really helpful overview!
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  How access to the listview from videopost
  r20 sdk • • m_tamura

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  Thank you, Sebastian. Your reply clearly shows what I should learn. I need a little time to understand, but I am working on it and I made a little progress. Cheers Makoto
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  Python Effectors
  python solved • • bencaires

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  Thanks dskeith, that code worked perfectly. Thanks for that!
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  R20 Script State Function
  python • • Motion4D

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  @y_puech and @dskeith Thank you both, that is extremely helpful as I didn't see any other documentation on that. I can see how state() could become very dangerous very quickly. I will certainly proceed with caution and hope this will help others will to not abuse the state() function as well:)