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)

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/

@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

Hi

How to update a spline if the number of points changes ?

If the number of points is the same, we can use the following function:

def spline_update(spline,tabPoint):
	dim = len(tabPoint)
	for i in range(0,dim):
		spline.SetPoint(i,tabPoint[i])

	spline.Message(c4d.MSG_UPDATE)
	return spline

If the number of points changes, we must use the ResizeObject() method

I'm looking for an example, which will save me from doing tests.

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()

Hi,

With a script, I create a large number of objects in my scene.
In the hierarchy, they are presented in the form of a list, which becomes difficult to read because it's too long.
So I want to put the names of the child objects under the name of the root object.
How can I do this ?

def hierarchie_organise(doc, object_root, list_object):
	# document name: doc
	# object root: object_root
	# child objects: list_object 

	# checking (exclusion of the root object if it's in the list of child objects)
	list_child = []
	for object in list_object:
		if object != object_root:
			list_child.append(object)

	# positioning of list_child objects under the object_root object
	...
	...
	...

	return 

True

I have created a function that adds points to a polygon.
But how to remove a point from a polygon, as well as remove the faces that contain it ?

Creation of UVW tag for a plane
I would like to know how to create texture coordinates for a plane, with python.
So I want to create with python the basic UVW tag for a plan.
I would like to get the same result as with Bodypaint.

@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,
I want to do a rotation for a polynone.
I know the coordinates of the points of the polygon, in the global coordinate system.
For this rotation, I know the axis of rotation, defined by a vector V, and the angle of rotation A with respect to this axis.

I manage to do this type of rotation, with matrices and with a change of Cartesian coordinate system, but I know that there is a much simpler method with C4D python functions

I am going to write a new script, using c4d.CallCommand and c4d.utils.SendModelingCommand which can do the same thing much faster.
The Script log window presents the code very well, in real time, for many operations.

@cairyn said in Polygon corresponding to a selection:

SendModelingCommand

Indeed, with SendModelingCommand it would be faster.
I don't remember how we visualize with C4D the python code corresponding to the actions of the keyboard and the mouse.