draw line from obj, but more than one line from same obj don't work

Tagged: annotation, draw line, empty

This topic has 5 replies, 3 voices, and was last updated 1 year, 4 months ago by kdv.

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2022-11-05 at 9:20 am #57098

Pascal
Customer

I have a complex interactive use case, but I break it down to this simple example.
The given obj is Suzanne, and there are two empty objects. To each Empty, an annotation is added in puzzles.
I want do draw a line from Suzanne to both annotations, but only the last drawn line is shown.

Will I have to add one exclusive additional empty as a distinct source for the obj, from where a line is drawn? Or is there another, maybe smarter solution?

Thanks for your feedback!
Best regards,
Pascal

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2022-11-07 at 8:01 am #57122

Yuri Kovelenov
Staff

Hi,

you might use multiple empty objects positioned in the same place, instead of your only main object.

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2022-11-07 at 8:43 am #57123

Pascal
Customer

OK, thank you for confirming the workflow.

2022-12-12 at 9:04 am #58983
kdv
Participant
Yuri Kovelenov wrote:

you might use multiple empty objects positioned in the same place, instead of your only main object.

or you can remove this strange code from the operateLineObjectHTML function
```
        for (var j = obj.children.length - 1; j >= 0; j--) {
            var child = obj.children[j];
            if (child.isLineHTML) {
                obj.remove(child);
                child.geometry.dispose();
                child.material.dispose();
            }
        }
```
what are the reasons to remove already added lines?

Puzzles and JS. Fast and expensive.

If you don’t see the meaning in something it primarily means that you just don’t see it but not the absence of meaning at all.
2022-12-13 at 9:55 pm #59041

Pascal
Customer

what are the reasons to remove already added lines?

I need to switch on/off interactively the connections (lines) between objects and html-divs, depending on the users input and cursors position. I solved it by adding more empty objects. But thank you for giving this interesting idea how I could hook in alternatively.

2022-12-13 at 10:34 pm #59042

kdv
Participant

The question was addressed to V3D team. Not to you )))

Pascal wrote:

I solved it by adding more empty objects

It’s a workaround. Removing those strings of code will allow you to add as many lines as you want to the same object.

Puzzles and JS. Fast and expensive.

If you don’t see the meaning in something it primarily means that you just don’t see it but not the absence of meaning at all.
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