jit.gl.isosurf

jit.gl.isosurf

Generates a GL based surface extraction

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.

GL Group

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 long Enables or disables the calculation of normal directions used for calculating lighting (default = 1).

dim int list[2] 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 symbol The mode of subdivision (default = cubes) Supported modes are:
cubes
tetra

Example:

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	long	Enables or disables the calculation of normal directions used for calculating lighting (default = 1).
dim	int list[2]	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	symbol	The mode of subdivision (default = cubes) Supported modes are: cubes tetra