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jit.gl.isosurf

Generates a GL based surface extraction

Description

The jit.gl.isosurf object creates a geometric surface from a volumetric density field. The polygonization occurs at locations where the density values intersect the edges of cells inside a subdivided cartesian grid. The subdivided grid can be made of either cubes or tetrahedrons, each of which will produce different types of geometric artifacts which may result in a surface which is comparitively better or worse depending on the volume dataset being used.
The jit.gl.isosurf object requires one argument: the name of a drawing context. A named drawing context is a named instance of a jit.window, jit.pwindow, or jit.matrix object that has an instance of the jit.gl.render object associated with it. This value may also be set via the OB3D drawto attribute.

Information for Jitter 3D Object (OB3D) messages and attributes to this object

Attributes

Name	Type	Description
autocolor	symbol	The autocolor mode for calculating vertex colors (default = normal) Supported modes are: none normal (normal direction) sample (density values)
autonormals	int	Enables or disables the calculation of normal directions used for calculating lighting (default = 1).
dim	int	The dimensions of the subdivided grid (default = 20 20 20)
displaylist	int	Cache in displaylist flag (default = 0) This feature may be used to speed up rendering time by creating and storing a list of gl drawing commands on the graphics card. This will have no effect if matrixoutput turned on.
epsilon	float	The epsilon value used for determining the delta for sampling normal directions. (default = 0.12)
isolevel	float	The density threshold for constructing the surface. (default = 1.0)
mode	int	The mode of subdivision (default = cubes) Supported modes are: cubes tetra

Information for box attributes common to all objects

Examples

Name	Description
jit.gl.graph	Open GL floating-point data visualization
jit.gl.gridshape	Generate simple geometric shapes as a connected grid
jit.gl.handle	Use mouse movement to control position/rotation
jit.gl.mesh	Generates GL geometry from existing data
jit.gl.model	Read and draw Wavefront .obj models
jit.gl.nurbs	Generate NURBS surface
jit.gl.plato	Generate platonic solids
jit.gl.render	Render Open GL
jit.gl.shader	Manages a GL shader
jit.gl.sketch	GL parallel to lcd
jit.gl.slab	Performs a GL accelerated grid-based evaluation
jit.gl.text2d	Write bitmap text
jit.gl.text3d	Write vector text
jit.gl.texture	Manages a GL texture
jit.gl.videoplane	GL accelerated video plane
jit.gl.volume	Creates a GL accelerated volume vizualization