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Atari demoscene BBS
| Re: Raycasting anyone ? |
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Posted by: dml
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Jun,28.2016-13:30
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"From what I heard on the web raycasting was mostly used in 3D games such as Doom tho. Main drawback was that you couldn't have stairs or slopes, right ?"
Raycasting is *one* way to determine the nearest point of contact between a point (such a the eye) and an occluding surface, like a wall. This helps solve visibility and draw-ordering at the same time. It is most often taking the form of a blind march across a grid of cells until a solid cell is contacted.
Wolf3D uses raycasting. Doom does not (it uses a BSP as an alternative way to determine visibility and ordering).
The game demo/example I did on STE does use raycasting, and does implement stairs and moving platforms with it, by combining some Doom-like drawing logic with Wolf-like raycasting across a regular grid of cells. Raycasting is a type of evaluation, not a type of visual effect.
Angled walls and floors could be done with raycasting, but probably with terrible efficiency for the latter, so other methods work better (IMO).
I wouldn't use the term 'raycasting' for effects which have been fully offline-calculated - e.g. tunnel effects (which are usually a type of fast image transformation). Raycasting involves testing a ray against some 'content' in order to determine what lies in its path, when this information can't be practically established somehow in advance...
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Topic
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Posted by
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Date
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Raycasting anyone ?
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s_t_s
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Jun,17.2016-08:51
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Re: Raycasting anyone ?
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evil
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Jun,23.2016-22:47
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Re: Raycasting anyone ?
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s_t_s
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Jun,25.2016-11:49
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Re: Raycasting anyone ?
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evil
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Jun,25.2016-12:48
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Re: Raycasting anyone ?
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s_t_s
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Jun,25.2016-18:57
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Re: Raycasting anyone ?
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wietze
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Jun,26.2016-17:49
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Re: Raycasting anyone ?
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s_t_s
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Jun,26.2016-18:27
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Re: Raycasting anyone ?
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mikro
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Jun,27.2016-00:39
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Re: Raycasting anyone ?
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Cooper
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Jun,27.2016-07:48
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Re: Raycasting anyone ?
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s_t_s
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Jun,28.2016-08:57
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Re: Raycasting anyone ?
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dml
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Jun,28.2016-13:30
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Re: Raycasting anyone ?
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s_t_s
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Jun,28.2016-14:50
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Re: Raycasting anyone ?
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mikro
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Jun,29.2016-00:32
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Re: Raycasting anyone ?
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s_t_s
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Jun,29.2016-11:40
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What's the anti-troll code?
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Don't have a code or forgot it? Fix it here.
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