2.5D but shoot projectiles along 2D arc around character

[SolariumScum]

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I’m making a 3d side-scroller game and I want to do a line trace from the character glasses to wherever I click on the screen with the mouse. I want this trace to stay on the same plane as my character, so the X value of the start point & end point should be the same. This is the best I could do, but it’s not accurate - When I click roughly in the center of the screen the trace is pretty accurate, but when I click further away from the center it gets less and less accurate…So…What am I doing w…

This is what got me here! Thanks so much exceptionally fast response, Ill try it later tonight when I get home, and report back! This has gotta be the missing piece of the puzzle!