Difference between revisions of "Prims"
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Eddy Stryker (talk | contribs) (New page: Primitives in Second Life are constructed by starting with a basic two dimensional shape, modifying it, and extruding it in to the third dimension along a path while applying modifications...) |
Eddy Stryker (talk | contribs) |
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==Introduction== | |||
Primitives in Second Life are constructed by starting with a basic two dimensional shape, modifying it, and extruding it in to the third dimension along a path while applying modifications to the extrusion. The most basic example is a cube which starts out as a 2D square and extrudes along a linear path with no modifications to make a cube. A cylinder starts out as as circle and extrudes along the same linear path. If the circle was extruded along a circular path you would create a ring, and if a half-circle is extruded along another type of circular path you create a sphere. | Primitives in Second Life are constructed by starting with a basic two dimensional shape, modifying it, and extruding it in to the third dimension along a path while applying modifications to the extrusion. The most basic example is a cube which starts out as a 2D square and extrudes along a linear path with no modifications to make a cube. A cylinder starts out as as circle and extrudes along the same linear path. If the circle was extruded along a circular path you would create a ring, and if a half-circle is extruded along another type of circular path you create a sphere. | ||
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* ProfileCurve | * ProfileCurve | ||
** A bitflag, the smaller bits define the outer profile shape and the higher bits define the type of hole if ProfileHollow is non-zero | |||
<pre> | |||
Circle = 0x00 | |||
Square = 0x01 | |||
Isometric Triangle = 0x02 | |||
Equal Triangle = 0x03 | |||
Right Triangle = 0x04 | |||
Half Circle = 0x05 | |||
</pre> | |||
<pre> | |||
Same = 0x00 | |||
Circle = 0x10 | |||
Square = 0x20 | |||
Triangle = 0x30 | |||
</pre> | |||
===2D Shape (Profile) Modifications=== | ===2D Shape (Profile) Modifications=== | ||
* ProfileBegin | * ProfileBegin | ||
** Where the cut (if any) in the profile begins | |||
* ProfileEnd | * ProfileEnd | ||
** Where the cut (if any) in the profile ends | |||
* ProfileHollow | * ProfileHollow | ||
** How much of the profile is hollowed out, as a percent of the original bounding box. If non-zero this creates a hole using the shape defined in the higher bits of ProfileCurve | |||
==Extrusion (Path)== | ==Extrusion (Path)== | ||
* PathCurve | * PathCurve | ||
** The extrusion path. For whatever reason only the upper bits are used in this field | |||
<pre> | |||
Line = 0x10 | |||
Circle = 0x20 | |||
Circle2 = 0x30 | |||
Test = 0x40 // ??? | |||
Flexible = 0x80 | |||
</pre> | |||
===Extrusion (Path) Modifications=== | ===Extrusion (Path) Modifications=== | ||
Revision as of 00:38, 1 July 2007
Introduction
Primitives in Second Life are constructed by starting with a basic two dimensional shape, modifying it, and extruding it in to the third dimension along a path while applying modifications to the extrusion. The most basic example is a cube which starts out as a 2D square and extrudes along a linear path with no modifications to make a cube. A cylinder starts out as as circle and extrudes along the same linear path. If the circle was extruded along a circular path you would create a ring, and if a half-circle is extruded along another type of circular path you create a sphere.
2D Shape (Profile)
- ProfileCurve
- A bitflag, the smaller bits define the outer profile shape and the higher bits define the type of hole if ProfileHollow is non-zero
Circle = 0x00 Square = 0x01 Isometric Triangle = 0x02 Equal Triangle = 0x03 Right Triangle = 0x04 Half Circle = 0x05
Same = 0x00 Circle = 0x10 Square = 0x20 Triangle = 0x30
2D Shape (Profile) Modifications
- ProfileBegin
- Where the cut (if any) in the profile begins
- ProfileEnd
- Where the cut (if any) in the profile ends
- ProfileHollow
- How much of the profile is hollowed out, as a percent of the original bounding box. If non-zero this creates a hole using the shape defined in the higher bits of ProfileCurve
Extrusion (Path)
- PathCurve
- The extrusion path. For whatever reason only the upper bits are used in this field
Line = 0x10 Circle = 0x20 Circle2 = 0x30 Test = 0x40 // ??? Flexible = 0x80
Extrusion (Path) Modifications
- PathBegin
- PathEnd
- PathScaleX
- PathScaleY
- PathShearX
- PathShearY
- PathTwistBegin
- PathTwist
- PathRadiusOffset
- PathTaperX
- PathTaperY
- PathRevolutions
- PathSkew