Post by raytomely in raycasting + floorcasting comments

Viewing post in raycasting + floorcasting comments

you're welcome... one thing you can do to deal with performance issue in pygame when it come to pixel manipulation or blitting so many things at once is as follow:

create a small display surface like (320, 240), blit everything on it (sprites must be tiny) then scal it to the screen size like (640, 420) then blit it on screen. that should resolve performance problems in raycasting and pseudo 3D engines, and I think this is how programmers dealed with it in the past when they have limited hardware resources.

TIDMADT5 years ago(+1)

Performance really isn't the issue... Here are the changes I have made:

1) I added the ability to have different "wall" types
2) I added a ceiling
3) I allowed for the floor and ceiling to have a different tile than the walls
4) I checked for collision with the wall before allowing you to move (kinda important!)
5) I added a soundtrack. The one I am using is Stones, from Ultima IX

The issue is that, now with different images, I see some "bleeding" on the wall images. For instance, if you look at the following image:

http://www.tidmadt.com/images/new_images/errors.jpg

you can see (where I circle in red) where slices from the wrong image are being rendered. This isn't a problem where ALL the images are the same, but I can't see where the line of sight is failing. As you can see in the code, what I do wherever you check to see if there is a wall (if grid[y][x]==1:) I set "wall_type" to what that wall is (a 1 or 2... wall_type = grid[y][x]) so it SHOULD be the same result for the entire segment of the wall... for some reason, some bands seem to be wrong.

Also, while the walls (resolution wise) seem to be fine, the ceiling and floors don't look right.

I created a GitHub fork of your code (giving you full credit for the original) here:

https://github.com/TIDMADT-SYS/simle-raycast

I have 2 versions there, the FPS (with free movement) and the crawler mode (which locks you into 90 degree turns, and one full grid space in movement)

Hopefully it is something minor... just not knowing that aspect of it as well as you, I can't see where in it the problem rests

Thank you in advance for taking time to look

raytomely5 years ago (2 edits) (+1)

sorry, I really don't have the time nor the will to delve in raycasting project right now. but I can point you to some useful resources that may help you in your project:

here is a good raycasting engine with floor and ceiling that work very well, there's even shadow implemented and it is derived from the permadi tutorial I believe, it is written in java script but you can easily port it to python:

https://github.com/permadi-com/ray-cast/tree/master/

here is other good raycasting tutorials with code and explanation:

https://dev.opera.com/articles/3d-games-with-canvas-and-raycasting-part-1/

https://www.playfuljs.com/a-first-person-engine-in-265-lines/

hope it help.

TIDMADT5 years ago(+1)

It is something to look at... I will let you know how it goes! Thanks

raytomely5 years ago (1 edit) (+1)

I just remembered to tell you that for the ceiling and the floors to be correct, change the value of the resolution variable to 1, you will have a clear image but unfortunately the performances will drop considerably, that's why I gave you some suggestions on how to improve performance in the first place.

TIDMADT5 years ago(+1)

That makes a lot of sense. I have tried it with the resolution set to 1, and it does eat up a lot of cycles.

in working with multiple textures for the walls, I have tried to set the wall_type where you find the wall hit, but it gets screwed up with the hor and vert hits... I think I would need to set the texture in (if wall_hit) but I am having problems at that point identifying the x and y of what wall we are drawing... I tried using ray_x and ray_y, but that does not seem to be the correct x and y of the wall...

TIDMADT5 years ago(+1)

I seem to have found it

raytomely5 years ago(+1)

that's nice

itch.io

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