如何增加光线投射渲染距离？

Question

To learn Golang and have fun with it I've attempted to convert an existing raycaster project from C# into Go: https://github.com/harbdog/raycaster-go

That original project is mainly based on the lodev raycasting tutorial.

This is my first time creating a raycaster engine, and I've managed to get it into good working order except one main problem: the render distance is too short and I would like to render farther out but I can't see an obvious parameter that would allow that. Any suggestions would be appreciated!

Here's a youtube video demoing it and the render distance problem if you look at when the larger wall in the distance decides to draw in: https://www.youtube.com/watch?v=HqNorhH37xY

Answer 1

It turned out to be a bug in the Ebiten 2D rendering engine that had recently been fixed! Updating to most recent version of Ebiten resolved the issue.

go get -u github.com/hajimehoshi/ebiten/...

The gist of it was that the older version of Ebiten would not render 1 pixel width images with a Y scaling of less than 0.25, which according to the Ebiten developer the issue was:

OK so the cause was the mipmap selection with the linear filter: if the determinant of the geometry matrix is small, mipmap is used, but in your case, the mipmap level is so high that the image width becomes 0. This doesn't happen with the nearest filter since mipmap is not used in this case.