How to make line2d's some parts have different transparency values

Help
,
1

Godot Version

4.4

Question

In paint.net i can do this below, so when i modulate this sprite node, red rectangled area becomes a little bit transparent while carrying the modulate color shade.

desired
desired1468×918 49.3 KB

I don’t know how to achieve this with line2d. Above method caused me some issues when i try to draw and connect lines (neighboring sprites) so i need to achieve this with line2d. Both sides (above and below) should have transparency

2

Probably use gradient and set alpha as appropriate along the gradient.

3

example
example1939×749 49.5 KB

Can you show me some examples? Can i do these “precise” transparency transitions with 1 line2d object, or do i need two more to handle above and below transparency. Also i couldnt find how to make it top down

4

It depends on how you want to do the transparency. If you want to make the line fade along the line, I think gradient is the solution. If you want to make the line fade so there’s a strip of translucent along the entire length of the line, I think instead you want to use a textured line.

5

example2
example2124×129 1009 Bytes

I think i found a way but dunno if there is better one
1 and 3 have the red shade as you see.
These three parts will have same width(they will follow each other). 1 and 3 will have half height of 2.
they will have same modulate but 1 and 3 will have alpha 31 out of 255.

So under Node2D having three line2d can help me achieve this?

6

I think you can do that with a single line2d by setting that as texture and setting texture_mode to LINE_TEXTURE_STRETCH.

Basically, give it a cross section of the line as a texture, and tell it to stretch that along the whole line.