Changing the alpha of a blueprint connection line


Blueprint UI is already great but you may want to change it a little bit.
In this posting, we will change the alpha of link line. The example is simple, but you'll get an idea of where to fix it.

Step 1.

\Engine\Source\Runtime\SlateCore\Private\Rendering\ElementBatcher.cpp
Locate the above file and modify it as shown below.

Honestly, it is not as readable as the original code. Let's improve a little more.

Step 2.

Let's change it to only apply when the line length is greater than 700.

Here is the result screen. I picked a blueprint that included longer lines.
The mid blue line is much more readable. It would be nice to add more exception conditions.

I will finish the example here.

More.

Consider the following:
  • Applies only when the length is very long(>=1000).
  • Applies only when the curve has a large S shape.
  • You can also change 'Thickness' instead of 'Alpha'.
  • It should be able to turn on/off on the setting screen.


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