material: Generic Appearance setup
In trestletech/rgl: 3D visualization device system (OpenGL)

Description Usage Arguments Details Value See Also Examples

Set material properties for geometry appearance.

rgl.material(
  color        = c("white"),
  alpha        = c(1.0),
  lit          = TRUE, 
  ambient      = "black",
  specular     = "white", 
  emission     = "black", 
  shininess    = 50.0, 
  smooth       = TRUE,
  texture      = NULL, 
  textype      = "rgb", 
  texmipmap    = FALSE, 
  texminfilter = "linear", 
  texmagfilter = "linear",
  texenvmap    = FALSE,
  front        = "fill", 
  back         = "fill",
  size         = 3.0, 
  lwd          = 1.0,
  fog          = TRUE,
  point_antialias = FALSE,
  line_antialias = FALSE,
  depth_mask   = TRUE,
  depth_test   = "less",
  ...
)
material3d(...)

`color`	vector of R color characters. Represents the diffuse component in case of lighting calculation (lit = TRUE), otherwise it describes the solid color characteristics.
`lit`	logical, specifying if lighting calculation should take place on geometry
`ambient, specular, emission, shininess`	properties for lighting calculation. ambient, specular, emission are R color character string values; shininess represents a numerical.
`alpha`	vector of alpha values between 0.0 (fully transparent) .. 1.0 (opaque).
`smooth`	logical, specifying whether Gouraud shading (smooth) or flat shading should be used.
`texture`	path to a texture image file. Supported formats: png.
`textype`	specifies what is defined with the pixmap "alpha" alpha values "luminance" luminance "luminance.alpha" luminance and alpha "rgb" color "rgba" color and alpha texture
`texmipmap`	Logical, specifies if the texture should be mipmapped.
`texmagfilter`	specifies the magnification filtering type (sorted by ascending quality): "nearest" texel nearest to the center of the pixel "linear" weighted linear average of a 2x2 array of texels
`texminfilter`	specifies the minification filtering type (sorted by ascending quality): "nearest" texel nearest to the center of the pixel "linear" weighted linear average of a 2x2 array of texels "nearest.mipmap.nearest" low quality mipmapping "nearest.mipmap.linear" medium quality mipmapping "linear.mipmap.nearest" medium quality mipmapping "linear.mipmap.linear" high quality mipmapping
`texenvmap`	logical, specifies if auto-generated texture coordinates for environment-mapping should be performed on geometry.
`front, back`	Determines the polygon mode for the specified side: "fill" filled polygon "line" wireframed polygon "points" point polygon "cull" culled (hidden) polygon
`size`	numeric, specifying the size of points in pixels
`lwd`	numeric, specifying the line width in pixels
`fog`	logical, specifying if fog effect should be applied on the corresponding shape
`point_antialias, line_antialias`	logical, specifying if points and lines should be antialiased
`depth_mask`	logical, specifying whether the object's depth should be stored.
`depth_test`	Determines which depth test is used to see if this object is visible, depending on its apparent depth in the scene compared to the stored depth. Possible values are `"never"`, `"less"` (the default), `"equal"`, `"lequal"` (less than or equal), `"greater"`, `"notequal"`, `"gequal"` (greater than or equal), `"always"`.
`...`	Any of the arguments above; see Details below.

Only one side at a time can be culled.

material3d is an alternate interface to the material properties, modelled after par3d: rather than setting defaults for parameters that are not specified, they will be left unchanged. material3d may also be used to query the material properties; see the examples below.

The current implementation does not return parameters for textures.

If point_antialias is TRUE, points will be drawn as circles; otherwise, they will be drawn as squares. Lines tend to appear heavier with line_antialias == TRUE.

The material member of the r3dDefaults list may be used to set default values for material properties.

The ... parameter to rgl.material is ignored.

rgl.material() is called for the side effect of setting the material properties. It returns a value invisibly which is not intended for use by the user.

Users should use material3d() to query material properties. It returns values similarly to par3d as follows: When setting properties, it returns the previous values in a named list. A named list is also returned when more than one value is queried. When a single value is queried it is returned directly.

rgl.primitive, rgl.bbox, rgl.bg, rgl.light

save <- material3d("color")
material3d(color = "red")
material3d("color")
material3d(color = save)

# this illustrates the effect of depth_test
x <- c(1:3); xmid <- mean(x)
y <- c(2, 1, 3); ymid <- mean(y)
z <- 1
open3d()
tests <- c("never", "less", "equal", "lequal", "greater", 
                  "notequal", "gequal", "always")
for (i in 1:8) {
  triangles3d(x, y, z + i, col = heat.colors(8)[i])
  texts3d(xmid, ymid, z + i, paste(i, tests[i], sep = ". "), depth_test = tests[i]) 
}