Render chunk - Revision history

Tonyhilliam at 00:46, 18 January 2018

2018-01-18T00:46:23Z

← Older revision		Revision as of 00:46, 18 January 2018
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	[[Category:Modeling]]		[[Category:Modeling]]
	[[Category:Content creation]]		[[Category:Content creation]]
	~~[[Category:TRS18]]~~

Tonyhilliam at 03:48, 17 January 2018

2018-01-17T03:48:08Z

← Older revision		Revision as of 03:48, 17 January 2018
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	Chunks inherit [[animation]] from their parent [[mesh]]. This is shared between the chunks of the same mesh instance, but not between separate mesh instances, even if they represent the same [[mesh file]] on disk.		Chunks inherit [[animation]] from their parent [[mesh]]. This is shared between the chunks of the same mesh instance, but not between separate mesh instances, even if they represent the same [[mesh file]] on disk.

			[[Category:Modeling]]
			[[Category:Content creation]]
			[[Category:TRS18]]

Windwalkr at 02:14, 16 October 2017

2017-10-16T02:14:45Z

← Older revision		Revision as of 02:14, 16 October 2017
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	* [[hardware instancing]]		* [[hardware instancing]]
	* import-time or load-time optimization of the chunks' parent [[mesh]].		* import-time or load-time optimization of the chunks' parent [[mesh]].

			Chunks inherit [[animation]] from their parent [[mesh]]. This is shared between the chunks of the same mesh instance, but not between separate mesh instances, even if they represent the same [[mesh file]] on disk.

Windwalkr: Created page with "A render chunk, or simply "chunk", is the encapsulated data required to issue a single* draw call. This includes a material, a vertex buffer, an [[index buffer..."

2017-10-13T09:05:26Z

Created page with "A render chunk, or simply "chunk", is the encapsulated data required to issue a single* draw call. This includes a material, a vertex buffer, an [[index buffer..."

New page

A [[render chunk]], or simply "chunk", is the encapsulated data required to issue a single* [[draw call]]. This includes a [[material]], a [[vertex buffer]], an [[index buffer]] and a small amount of metadata. A 3D [[mesh]] is comprised of a number of render chunks. The render chunk's material may be [[material sharing|shared]] with other render chunks in the same mesh or other meshes in the same asset.

Render chunks are a data packet (ie. noun) rather than an action on the GPU (ie. verb). The act of submitting a render chunk to the GPU for rendering is known as a [[draw call]].

There are numerous cases where the use of a single render chunk may technically result in multiple draw calls; eg.
* where the chunk's parent mesh is present multiple times in the scene.
* where a multi-pass material is used (in Trainz, this is currently limited to a depth prepass used for some materials, the details of which are trainz-version specific).
* for shadow rendering.
* when the scene is rendered from multiple views (for example, for true reflection rendering).

There are also some cases where multiple render chunks may be rendered in a single draw call. This can only occur in cases where the chunks all share a single material:
* [[mesh stitching]]
* [[hardware instancing]]
* import-time or load-time optimization of the chunks' parent [[mesh]].