But...I thought you knew.

Raycasting is a form of raytracing that casts fewer types of rays for a faster but less accurate render.

to the letter. "cast" means "collision". so finding "collision" is raycasting. if you concerns secondary rays after collision, it becomes raytracing.

@T.Ocarina it's confusing for me so by adding more rays you mean finding collision on the particular wall from different points of view?or that's wrong or is it just adding more vectors to your regular only view

i'm confused since i'm trying to picture a 3dimensional grid and built an object on that i didn't study programming all i know is self discoveries i don't know the terms and algorithms like the sorting algorithms,raytracing,rngs i did pong but it was super slow in a ti83,and so many games and apps but they were self discoveries a friend of mine did pong with levels,with speeds and tougher cpu

he did it without using assembly lenguage.....and i can't think on making a pong game in a ti calc like that

no. "secondary ray" doesnt mean "other ray". it means the rays which is raised by initial ray. for example,reflection, refraction,diffraction,scattering,diffusing rays. if you think about these rays, it is called raytracing.

so what is the initial ray? is it the line you cast from viewpoint,or the verticle height you make on the object you hit from viewpoint?

i cannot understand "verticle height", but initial ray means the ray casting from your view point,usually. (noting that raytracing and raycasting isnot only for rendering and the meaning of "initial ray" changes depending on the situation.

what do you mean,not just for rendering?

raycasting is widely used to detect collision. laser beam and enemy in shooting game, que and ball in billiard, enemy sniper sight and wall, and so on. ray tracing is also used in many applications. Camera lens Design, Car light design, cosmic radiation shower simulation, etc... rendering(drawing 3D object in 2D screen) is no more than one of the application.

what is the cameraangle here rayangle=cameraangle-fov/2 to cameraangle+fov/2 step fov/horizon

> all i know is self discoveries "self discovery" is the best. exciting and impressive. thit question is not so difficult. I think you can understand it by yourself. keep it up :D hint: fov is abbreviation of "field of view"

muaaaaaaahhhhh not again

i know the fov and horizon,but what is camerangle? for me fov and cameangle is the same rayangle 'cause i think fov is my view from screen,which is my cameraangle and ray angle is where i'll shoot my ray/rays

the code you showed means... it assume(approximate) curved screen(part of cylinder). the view point is the center of the cylinder. "rayangle" is the angle of the casting ray. "cameraangle" is the angle to the center of the screen. "fov" is the angle of the arc streched by the screen "horizon" is the number of the pixels of the screen. it's all.

when it says 'step' fov/horizon i'm shooting every line z forwardly?

no. I think it means cast one ray at rayangle=cameraangle-fov/2 then cast next ray at rayangle=cameraangle-fov/2 + fov/horizon then cast next ray at rayangle=cameraangle-fov/2 + 2* fov/horizon ... finally, cast last ray at rayangle=cameraangle+fov/2 as usual "FOR ... NEXT" loop.

raytracing is slower than raycasting because you shoot a ray to every pixel on screen 400x240 pixels is 96000 pixels but gives a better image because raycasting only shoots rays equal to the horizon(which is 400 because it is the length of the screen. raytracing produces shading and a better image. I dont think raycasting can produce shaded walls,floors and ceilings.