Topics created by Kantronin

The following example illustrates my problem.
In this example, I translate and rotate the ring using C4D's interface.

In figure 1, the ring is at point (0,0,0) with an angle of zero.
Figure 1

In figure 2, using the Cinema 4D interface, I translate the ring with the vector <2,1,3> in centimeters.
Then I performed three successive rotations: 322° on the X axis, 30° on the Y axis and 343° on the Z axis.
Cinema 4D positioned the axis center of the ring correctly.
Figure 1

But when I create my ring with 4 splines, at a point in space other than (0,0,0), the axis center always remains at the point (0,0,0) with an angle of zero.
I'd like the axis center to be at the center of my ring and at the same angle as in Cinema 4D.

@ferdinand

I made this function which works fine:

def spline_update(doc,spline,tabNewPoint): tabPoint = spline.GetAllPoints() dim = len(tabNewPoint) if len(tabPoint) != dim: spline.ResizeObject(dim) for i in range(0,dim): point = tabNewPoint[i] spline.SetPoint(i,point) spline.Message(c4d.MSG_UPDATE) return spline

I found the solution on https://plugincafe.maxon.net/
It was enough in the for loop to add the following line of code:

for object in list_object:
if object != object_root:
object.InsertUnder(object_root)
c4d.EventAdd()

Hey @kantronin,

Thank you for reaching out to us. I would recommend having a look at the Modeling Python Examples. They are a bit hidden, but in the Geometry section I went over the general classic API geometry model of Cinema 4D.

Regarding your core questions:

Removing points from a polygon: Without wanting to be overly pedantic, I must point out that polygons only index vertices, they do not hold them; CPolygon references with its fields a, b, c, and d the vertices of the PolygonObject it is attached to. In this sense removing points from a polygon is not possible, you can just de-index them. Cinema 4D expresses both triangles and quadrangles with the type CPolygon, i.e., as quadrangles. A triangle simply repeats its c index in its d index. I explained this in the modelling examples in more detail. Removing vertices or polygons from a PolygonObject: There is neither a PolygonObject.RemovePolygon nor aPointObject.RemovePoint if that is what you are looking for. When you want to change the vertex or polygon count of a PolygonObject, you must call PolygonObject.ResizeObject and then call PointObject.SetAllPoints() and for each (new) polygon PolygonObject.SetPolygon. The operation_extrude_polygons_s26 example covers this subject, although I go there into the opposite direction, I increase the point and polygon count rather than decreasing it.

PS: Useful might also be geometry_polygonobject_s26 because I explained there the type from scratch.

Cheers,
Ferdinand

hi,

you can use CallUVCommand. The forum also has different thread already talking about it. This one for example, explain how to use command to pack your UVs. It shows how to automatically unwarp your model and answer what you are looking for. This is done using SendModelingCommand with some parameters, those parameters can be found here in the c++ documentation.

Of course, you can also create the uvw tag yourself and define the uvw coordinates as you wish. You have this thread for example that shows how to do a planar projection.

Cheers,
Manuel

@ferdinand

Thanks, it works well

My first method was complex:

creation of a new orthogonal spatial system, with one of its axes is identical to the axis of rotation compute the coordinates of the points of the object in this new spatial system, then rotate the object calculation of the new coordinates in the initial orthogonal spatial system.

Hi @Kantronin I don't think there is that much to add but I want to mention that c4d.CallCommand automatically add an undo to the undo stack, while c4d.utils.SendModelingCommand with it's flags arguments can be defined. But you need to start and end the undo with the c4d.utils.SendModelingCommand, so this way you can have multiple SendModelingCommand within an undo.

See basedocument_undo example for undo management.

Cheers,
Maxime.

Hi @Kantronin, I don't have a lot to add Thanks @Cairyn , for more information about the console, please read Python Console.

Cheers,
Maxime.

Thanks for your quick replies

I used GetBaseSelect() which allowed me to have the selected faces for each selection

list_polygon = obj.GetAllPolygons() dim = len(list_polygon) L = [] tag = obj.GetFirstTag() while tag: if tag.GetType() == c4d.Tpolygonselection: sel = tag.GetBaseSelect() L2 = [] for i in range(0,dim): if sel.IsSelected(i): L2.append(i) L.append([tag.GetName(),L2]) tag = tag.GetNext() for item in L: print item[0] print item[1]

I found the solution to my problem, on the internet, with code samples:
https://www.c4dcafe.com/ipb/forums/topic/101805-materials-and-shaders-with-python/

I found the solution (I already had this problem but I couldn't remember the right code)

mat [c4d.MATERIAL_TRANSPARENCY_COLOR] = c4d.Vector (1.0, 1.0, 1.0) #color white
mat.Update (True, True)

hi,

juste as a follow up, we've update our example and include this one.

insert a material to the selected polygons

Cheers,
Manuel

Hi Kantronin, thanks for reaching out us and welcome to PluginCafé.

To make Cinema 4D programatically executing modeling commands, you can make use of SendModelingCommand which properly satisfy your scope.
Aside from the example shown in the documentation you can also have a look at this post from @maxime and this other post about Optimize command.
Last but not least be aware that the modeling command settings are specified in the BaseContainer passed to the SendModelingCommand and whose parameters can be found in the MCOMMAND page.

Finally please remind to use Tags and Ask as a question for any future support entries

hello,
without information from your part, i'll consider this thread as solved and change its states

Cheers,
Manuel

hello,

you have to use the step parameter as showned in the documentation here

self.SetFloat(datafield_displacement, 1.0, min=0.0, step=0.1)

Cheers,
Manuel

Hi @SmetK,

Please note that we have a great Matrix Manual with code samples. You can also check our github repository for the geometry examples, e.g. the Polygon Object example.

For your further questions I kindly encourage you to create new thread and shape your posting according to how it's described in our Support Procedures: Asking Question.

Cheers,
Ilia

Hello,

For your next threads, please help us keeping things organised and clean. I know it's not your priority but it really simplify our work here.

Q&A New Functionality. How to Post Questions especially the tagging part.

@zipit and @Cairyn have already answer here (thanks a lot) nothing to add.

Cheers,
Manuel

I used the frame of your code to make plugins from scripts that I wrote, and now I can send my results to the console.
Thanks