Oldest known version of this page was edited on 2006-08-18 19:14:08 by skinhat []
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Specifies how a texture is mapped to a GLScene object. For example it is possible to have a teapot reflect a texture so as a teapot is moved the reflection changes similar to a real reflection.
TGLTextureMappingMode is the class for the property
mappingmode of
TGLTexture.
TGLTextureMappingMode is the enumerated type:
TGLTextureMappingMode = (tmmUser, tmmObjectLinear, tmmEyeLinear, tmmSphere,tmmCubeMapReflection, tmmCubeMapNormal,tmmCubeMapLight0,tmmCubeMapCamera);
tmmUser: the user specifies how a texture is mapped onto an object. In GLScene this mapping is done for you. For example you dont have to map parts of a texture onto the vertices of a plane yourself. tmmUser is the default mapping mode.
The other mapping modes are automatic and dont require the user map the texture though the
TGLTexture property
mappingscoordinates and
mappingtcoordinates gives some control.
tmmObjectLinear: The texture is projected onto the object. For example:
(Picture from
Rosalee Wolfes site∞)
The texture is fixed to the object so if the object moves the texture will stay fixed to the object. The object is mapped with whatever section of the texture it is passing over. The way the texture is projected onto the object is specified by
mappingscoordinates and
mappingtcoordinates.
tmmEyeLinear: the texture is fixed in space. As you move the object through space the texture will change. For example as the teapot below is moved away the texture moves:
Note that if the
imageclass isn't a 'Cubemap Image' then the behaviour seems similar to tmmObjectLinear. Mappingscoordinates and mappingtcoordinates specifies the orientation of the texture in space. The longer the axis vector the smaller the texture appears.
tmmSphere : wraps a single 2d texture as a sphere producing a reflective looking surface. As the object is moved the reflection moves like in real life. Problem of producing two singularities (ie the poles on a globe).
(Picture from
Rosalee Wolfes site∞)
The rest of the mapping modes use
cube mapping. Refer to the article about
cube mapping for more information.
tmmCubeMapReflection: is similar to tmmSphere in that as an object is moved the reflection moves like in real life. But instead of a single 2D texture wrapped around like a sphere (like tmmSphere) 6 textures are places around the object as a cube map.
tmmCubeMapNormal:Similar to tmmCubeMapReflection except that the cube map is fixed to the objects surface rather than staying static in space therefore doesn't appear as a reflection.
Unit:
GLTexture∞
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