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NOTE: To utilize the full capabilities of the UV Map 3D node, it helps to have a basic
understanding of how 2D images are mapped onto 3D geometry. When a 2D image is
applied to a 3D surface, it is converted into a texture map that uses UV coordinates to
determine how the image translates to the object. Each vertex on a mesh has a (U, V) texture
coordinate pair that describes the appearance the object takes when it is unwrapped and
flattened. Different mapping modes use different methods for working out how the vertices
transform into a flat 2D texture. When using the UV Map 3D node to modify the texture
coordinates on a mesh, it’s best to do so using the default coordinate system of the mesh or
primitive. So the typical workflow would look like Shape 3D > UV Map 3D > Transform 3D. The
Transformation tab on the Shape node would be left to its default values, and the Transform
3D node following the UV Map 3D does any adjustments needed to place the node in the
scene. Modifying/animating the transform of the Shape node causes the texture to slide
across the shape, which is generally undesirable. The UV Map 3D node modifies texture
coordinates per vertex and not per pixel. If the geometry the UV map is applied to is poorly
tessellated, then undesirable artifacts may appear.
Common Controls
Settings Tab
The Settings tab in the Inspector is duplicated in other 3D nodes. These common controls are
described in detail at the end of this chapter in “The Common Controls” section.
Weld 3D [3WE]
The Weld 3D node
Weld 3D Node Introduction
Sometimes 3D geometry has vertices that should have been joined when the geometry was created,
but for one reason or another they are not joined. This can cause artifacts, especially when the two
vertices have different normals.
For example, you may find:
– The different normals produce hard shading/lighting edges where none were intended.
– If you try to Displace 3D the vertices along their normals, they crack.
– Missing pixels or doubled-up pixels in the rendered image.
– Particles pass through the tiny invisible cracks.
Instead of round tripping back to your 3D modeling application to fix the “duplicated” vertices, the
Weld 3D node allows you to do this in Fusion. Weld 3D welds together vertices with the same or
nearly the same positions. This can be used to fix cracking issues when vertices are displaced by
welding the geometry before the Displace. There are no user controls to pick vertices. Currently, this
node welds together just position vertices; it does not weld normals, texcoords, or any other vertex
stream. So, although the positions of two vertices have been made the same, their normals still have
their old values. This can lead to hard edges in certain situations.
Chapter 893D Nodes 1700
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