Sprite: Difference between revisions
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In source, a '''[http://en.wikipedia.org/wiki/Sprite_%28computer_graphics%29#Move_to_3D Sprite]''' is a rendered world object with very special geometrickery. The sprite itself is a (static or animated) 2D image that looks 3D when viewed ''Normally'' (ie perpendicular to its surface). The trick is to make sure the player always views the sprite normally; which usually means the sprite | In source, a '''[http://en.wikipedia.org/wiki/Sprite_%28computer_graphics%29#Move_to_3D Sprite]''' is a rendered world object with some very special geometrickery. The sprite itself is a (static or animated) 2D image that looks 3D when viewed ''Normally'' (ie perpendicular to its surface). The trick is to make sure the player always views the sprite ''normally''; which usually means rotating the sprite about its origin so it is always facing the Player. Obviously in multiplayer this rotation in World would not work, so the sprite is rotated only in the [[Player View]]. | ||
Although their usefulness is severely limited, ''sprites'' are significantly "cheaper" to render than models or brushwork, and can also achieve convincing effects that would be impractical to model in 3D. | Although their usefulness is severely limited, ''sprites'' are significantly "cheaper" to render than models or brushwork, and can also achieve convincing effects that would be impractical to model in 3D. | ||
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* [[env_steam]] | * [[env_steam]] | ||
* [[prop_detail_sprite]]<!-- note: very different to behaviour env_sprites--> | * [[prop_detail_sprite]]<!-- note: very different to behaviour env_sprites--> | ||
==Placement== | ==Placement== | ||
Revision as of 14:11, 7 May 2008
In source, a Sprite is a rendered world object with some very special geometrickery. The sprite itself is a (static or animated) 2D image that looks 3D when viewed Normally (ie perpendicular to its surface). The trick is to make sure the player always views the sprite normally; which usually means rotating the sprite about its origin so it is always facing the Player. Obviously in multiplayer this rotation in World would not work, so the sprite is rotated only in the Player View.
Although their usefulness is severely limited, sprites are significantly "cheaper" to render than models or brushwork, and can also achieve convincing effects that would be impractical to model in 3D.
- Lighting: Sprites cannot cast or receive any kind of shadows, nor reflect cubemaps.
- Physics: Sprites cannot be Solid to anything.
Sprite entities
Placement
Todo: ... general usage guidelines ... configuring sprite entities in Hammer.
- See Render Modes.
- See Attachments and Movement hierarchy.
Creation
Todo: ...guidelines/checklist for designing & implementing sprites.
- Design guidelines.
- the image inside the sprite already depicts a three dimensional object;
- the animation is constantly changing or depicts rotation;
- the depicted object has a similar appearance from many common viewing angles (such as something spherical);
- the viewer accepts that the depicted object only has one perspective (such as small plants or leaves).
- the sprite exists only briefly, is NotSolid, ... player cannot inspect it too closely.
- SPR file format...
- VTF: Vtex compile parameters "clamps", "clampt". note: env_sprite_oriented #angles ...
- VMT: Shaders_in_Sprites\