About ArtMeshes

Updated: 07/06/2020

On this page you will learn about ArtMeshes.

What Is an ArtMesh?

PSD images loaded into the model workspace are automatically assigned a mesh for each layer and placed on the canvas.
Each of these is an “ArtMesh.”

In the image below, a set of polygons (mesh) composed of vertices and lines is assigned to the eyebrow image (texture).
By moving each of these vertices, the image can be deformed to create expression and movement.

Upon importing a PSD, each layer (or group) in the PSD is automatically placed as an ArtMesh, but if all meshes are very detailed, the data volume will be too large.

Thus, immediately after placement, the ArtMesh consists of a minimum number of vertices.
Note: However, when using videos that do not use the SDK, there is no need to be aware of the data capacity, as it does not affect the data volume.

These default state ArtMeshes can be further edited in detail to suit the image you want to deform.
See the “Automatic Mesh Generator” page for more information on how to edit the mesh in detail.

Blend mode

You can specify how the colors of the ArtMesh are composited.
The default setting is [Normal].

Normal	Additive	Multiply
The image cut from the texture is overlapped as is.	This is suitable for glowing expressions.	This is suitable for expressions with darker colors, such as shadows.

Culling

Culling is the function not to draw the backside of polygons.

The default setting is [Off].

Selected (one sided drawing) Polygons are not drawn when the part is flipped over.	Cleared (double-sided drawing) Polygons are drawn regardless of the reverse side.

Turn on if you want the part to disappear when the polygon is flipped over.
Turn off if you want to create a part flipped horizontally with the polygon flipped over.

How to Calculate Triangulation

The triangulation calculation method has been changed since Cubism 3.0.07.

Automatic Polygon => Triangle Transformation (Automatic Edge Connection)

Both Cubism 2.1 and 3.0 or later have a mechanism to convert a polygon (square or larger) or unconnected points into a triangle by connecting them.
This allows us to draw at high speed using 3D hardware.

The light blue area in the figure is an auto connection

Cubism 2.1 calculation method:
2.1 uses a very simple method of connection, whereby squares and other objects are triangulated without consideration of angles.
The calculations were such that the connection was made in a shape that exceeded a pentagon and was not very appropriate.

Cubism 3.0 or later calculation method:
3.0 or later, the structure has been changed to generate triangles as naturally as possible, even for polygons beyond the pentagon and in situations where the points are not well connected.
Note: The system was buggy until 3.0.06, but has become significantly more stable since 3.0.07.

For models generated from 2.1 cmox

Before 3.0.06:

• When loading the .cmox file created in 2.1, the process of creating triangles was being executed using the calculation method for 3.0.
  (However, due to differences in calculation methods between 2.1 and 3.0 and a bug up to 3.0.06, some meshes loaded from 2.1 were missing.)

3.0.07 or later:

• To ensure that models created in 2.1 can be safely used in the SDK for 3.0 without modification, the .cmox file is now triangulated in Cubism 3.0 using the same calculation method as in 2.1 when loaded.
• In 3.0, the calculation method for 2.1 works as long as no mesh editing (automatic or manual) is performed on each ArtMesh. By exporting moc3 and moc files as is, they can be safely used with the same results as in 2.1.
• The system is designed to switch to the 3.0 off-style triangulation process once the mesh editing (automatic or manual) of each ArtMesh is performed in the 3.0.
• 3.0.07 fixes a bug that occurred prior to 3.0.06 and improves the connection to be cleaner and safer.