Re: A new portal rendering system for Marathon


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Re: A new portal rendering system for Marathon

Posted By: Fart Feelings Date: 7/30/26 8:23 a.m.
In Response To: Re: A new portal rendering system for Marathon (Lion O Cyborg)

I'm still testing the portal renderings full potential for Marathon levels.
It renders Bisqwit's portal rendering tutorial level correctly.
It rendered Pfhactory N'Utopia at a good FPS.
Had a problem with the 900 portals visible at the same time and I am trying to figure out why the triangles collapsed.
This design is different from previous portal rendering, the visibility test is done in screen space with overlapping rectangle axis aligned bounding boxes and AABB intersection to make a reduced AABB.
The triangles and portals must be geometrically clipped in clip space to the camera bound planes before making the AABBs.
Triangle AABB intersect the portal AABB to make an AABB to discard pixels in the shader.
The fragment shader discards pixels outside of the triangle structs AABB in screen space.
That's how 5D space works in this portal rendering.
The AABB tests are fast and cheap.

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Replies:

A new portal rendering system for Marathon Fart Feelings 7/23/26 1:36 a.m.

Re: A new portal rendering system for Marathon Lion O Cyborg 7/28/26 12:54 p.m.

Re: A new portal rendering system for Marathon Fart Feelings 7/30/26 8:23 a.m.

Re: A new portal rendering system for Marathon Fart Feelings 7/31/26 9:59 a.m.

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: I'm still testing the portal renderings full potential for Marathon levels. : It renders Bisqwit's portal rendering tutorial level correctly. : It rendered Pfhactory N'Utopia at a good FPS. : Had a problem with the 900 portals visible at the same time and I am trying : to figure out why the triangles collapsed. : This design is different from previous portal rendering, the visibility test : is done in screen space with overlapping rectangle axis aligned bounding : boxes and AABB intersection to make a reduced AABB. : The triangles and portals must be geometrically clipped in clip space to the : camera bound planes before making the AABBs. : Triangle AABB intersect the portal AABB to make an AABB to discard pixels in : the shader. : The fragment shader discards pixels outside of the triangle structs AABB in : screen space. : That's how 5D space works in this portal rendering. : The AABB tests are fast and cheap.

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A new portal rendering system for Marathon	Fart Feelings	7/23/26 1:36 a.m.
Re: A new portal rendering system for Marathon	Lion O Cyborg	7/28/26 12:54 p.m.
Re: A new portal rendering system for Marathon	Fart Feelings	7/30/26 8:23 a.m.
Re: A new portal rendering system for Marathon	Fart Feelings	7/31/26 9:59 a.m.



	Your Name:
	Your E-Mail Address:
	Subject:
	Message: : I'm still testing the portal renderings full potential for Marathon levels. : It renders Bisqwit's portal rendering tutorial level correctly. : It rendered Pfhactory N'Utopia at a good FPS. : Had a problem with the 900 portals visible at the same time and I am trying : to figure out why the triangles collapsed. : This design is different from previous portal rendering, the visibility test : is done in screen space with overlapping rectangle axis aligned bounding : boxes and AABB intersection to make a reduced AABB. : The triangles and portals must be geometrically clipped in clip space to the : camera bound planes before making the AABBs. : Triangle AABB intersect the portal AABB to make an AABB to discard pixels in : the shader. : The fragment shader discards pixels outside of the triangle structs AABB in : screen space. : That's how 5D space works in this portal rendering. : The AABB tests are fast and cheap.
	If you'd like to include a link to another page with your message, please provide both the URL address and the title of the page:
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	Password: