How does C4D calculate pos of selected objects?

Helper

On 17/06/2015 at 11:15, xxxxxxxx wrote:

Should simply be the centroid of all of their positions. Loop through all of the selected lights, get their positions (you may need to consider global vs. local - global is recommended), sum the position vectors (sum += pos), and after the loop divide the vector (sum) by the number of lights.

PseudoCode:

Vector sum = Vector(0.0);
Int32 nlights = number of selected lights;
for (All selected lights)
{
	sum += light->GetMg().off;
}
// This will be the centroid between the light positions
sum = sum / nlights;

Helper

On 17/06/2015 at 12:34, xxxxxxxx wrote:

Hi Robert!

Well, I think C4D does it another way.
With 2 objects it works fine, but as soon as there are more, it tends to give problems.

Still thanks for your answer!

With kind regards,
Casimir Smets

Helper

On 17/06/2015 at 12:43, xxxxxxxx wrote:

Let me run some tests on my end and get back with results and code.

Helper

On 17/06/2015 at 12:56, xxxxxxxx wrote:

AFAIK it's the bounding box of the selected objects' axes.

MinMax mm;
for (All selected lights)
{
    mm.AddPoint(light->GetMg().off);
}
Vector min = mm.GetMin();  
Vector max = mm.GetMax();

Helper

On 17/06/2015 at 14:53, xxxxxxxx wrote:

Hi Niklas!

Thanks for your answer!!

That did it, apparentally that's the way C4D handles multi-selection of objects.

(You can mark this as solved)

With kind regards,
Casimir Smets

Helper

On 18/06/2015 at 06:22, xxxxxxxx wrote:

Hello,

to get the axis of a multi-selection one can use BaseDocument::GetHelperAxis().

Best wishes,
Sebastian

Helper

On 18/06/2015 at 06:32, xxxxxxxx wrote:

Hi Sebastian,

Thanks for your answer!!
GetHelperAxis is faster than the solution Niklas gave me.

You can mark this as solved!
With kind regards,
Casimir Smets

Helper

On 18/06/2015 at 11:01, xxxxxxxx wrote:

Hi,

Is there also such a function as GetHelperAxis for point/edge/polygon selection?
And what about pointselections from multiple objects? Or should I do this manually if I want to support that? (Because C4D doesn't seem to calculate that position...)

Thanks in advance for your help and time!
Greetings,
Casimir Smets

Helper

On 19/06/2015 at 02:03, xxxxxxxx wrote:

Hello,

point selections on multiple (polygon) objects seem to work fine with GetHelperAxis(). You answered your other question already in your other thread:

How to get Modeling Axis?

best wishes,
Sebastian

Helper

On 19/06/2015 at 06:18, xxxxxxxx wrote:

Hi Sebastian,

Thanks for your answer!!
That indeed also works for multi-object pointselections.

You can mark this as solved!

With kind regards,
Casimir Smets