Align to Vector
Set the Texture Editor Previews View From to Above +Z. Think of the texture axes as if they're not aligned to vector. From the top, the X axis is up and down, the Y axis is side to side, and the Z axis is perpendicular to the XY plane. Apply your texture so makes sense in the coordinate space. Check align to vector and the texture will follow the vector: the X axis is along the vector, the Y axis is side to side, and the Z axis is up and down. Velocity axis directions follow the same convention.
HSV Merge element
Has texture options for Hue, Value, and Saturation. Great for using low-resolution color imagery (like Landsat) as Hue to color high-resolution panchromatic imagery (like DOQQs) as Value.
It remaps the values of the texture used to blend the two images together, thereby increasing contrast. The remap function itself does not blend the images. Try the following settings to see this in action.
Experiment with the other remap functions. You may find the Square Wave function easier to use. The bell curve function also has some nice effects.
Another from the Conversations with Adam 'Remap' Hauldren collection
Texture not rendering on vector-bounded Ecosystem
Is the Texture Editor Coordinate Space Align to Vector?
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