How do we put electrodes on the skin surface?

[bryn]

You don't "apply the skin" to something. The process suggested and described with gifs above is to "project" (Surface Projection) some entities (electrodes) onto some surface (e.g. the Skin).

To activate the tool you need to select the electrodes AND skin (last selected entity) entities.

[bryn]

@gotou here is a video I created some time ago explaining how to project an entity onto the skin. The video creates a 3d text entity, but the same works for a brick.

• create entity in XY plane
• set faceting settings, e.g. edge length 1-5mm (Mesh Tools -> Edit Faceting)
• convert to triangle mesh (Mesh Tools -> To Mesh)
• select entity and Skin
• start projection tool (Project -> Surface Projection)

Youtube Video

[gotou]

@bryn

Thank you for your response .

I followed the steps as shown in the video:

Create the XY entity
Set the facets
Convert to a mesh
Modify the skin as needed using the Mesh Doctor
Select the entity, then select the skin
Perform the projection
However, as shown in the attached image, the result appears to be piercing perpendicularly into the skin.

Do you know why this might be happening?

I look forward to your response

[bryn]

• did you try to move/pre-align the "XY entity" (using Move tool)? If yes, please don't do that.
• can you share the XY entity or run following script and share the output?

import XCoreModeling as xcm

# assumes you select the XY entity, then run the script
xy_entity = xcm.GetActiveModel().SelectedEntities[0]
p1, p2 = xcm.GetBoundingBox([xy_entity])
print(f"p1={p1}, p2={p2}")

[gotou]

＞did you try to move/pre-align the "XY entity" (using Move tool)? If yes, please don't do that.
I was able to properly attach it to the surface by using projection without the move tool.

can you share the XY entity or run following script and share the output?
This was output.

p1=205 179 1799 , p2=205 229 1894

Why doesn't it work correctly when using the move tool?

[bryn]

glad you managed :thumbs_up:

[gotou]

@bryn
I figured out how to project a single object. However, how can I project a two-layer object onto the skin? The idea is that the first layer is gel, and the second layer is an electrode plate. I tried various methods, but I couldn't figure out how to do it in two layers. I tried projecting the gel onto the skin first and then placing an electrode plate the same size as the gel on top, but the projection was applied to both the front and back of the gel.
(Gel is yellow,electrode is purple)

[bryn]

• the entities (in the XY plane) should be one above the other
• select BOTH entities, and the skin
• project both at the same time (pick position, edit angle, etc.)

[bryn]

with "automatic centering", the object will be partly inside the skin.
if you disable automatic centering, you can project all object above each other (and the skin)

[gotou]

@bryn @gc00 @halder
Thank you so much, You've been very helpful !