Create render options

Usage

render_options(
  width = 800L,
  height = 600L,
  shading = c("smooth", "flat"),
  backface_culling = TRUE,
  background_color = c(1, 1, 1, 1),
  default_color = c(0.7, 0.7, 0.7, 1),
  invert_normals = FALSE,
  wireframe = FALSE,
  wireframe_color = c(0, 0, 0, 1),
  projection = c("perspective", "orthographic"),
  specular_color = c(0, 0, 0, 0),
  shininess = 0,
  lights = NULL,
  ambient = 0.3,
  contrast = 1,
  fog_enabled = FALSE,
  fog_start = 0,
  fog_end = 1,
  fog_color = c(0, 0, 0, 0),
  threads = 0L,
  clip_planes = NULL,
  ssao_enabled = FALSE,
  ssao_radius = 16,
  ssao_intensity = 0.8,
  aa_samples = 1L
)

Arguments

width: Output image width in pixels.
height: Output image height in pixels.
shading: Shading mode: "smooth" or "flat".
backface_culling: Whether to cull back-facing triangles.
background_color: Background RGBA color as numeric vector of length 4 (values 0-1).
default_color: Default vertex color when no colors are provided.
invert_normals: Whether to invert surface normals.
wireframe: Whether to render in wireframe mode.
wireframe_color: RGBA color for wireframe edges (0-1 scale). Default c(0, 0, 0, 1) (black).
projection: Projection type: "perspective" (default) or "orthographic". Orthographic gives a parallel projection (no perspective foreshortening), matching rgl's view3d(fov=0) convention.
specular_color: Specular highlight color (0-1 scale). When shininess > 0, a Blinn-Phong highlight in this colour is added where the surface faces the camera. Default c(0, 0, 0, 0) (off).
shininess: Specular exponent controlling highlight sharpness. Higher values produce a tighter spot. Typical values: 32 (soft plastic), 64 (shiny), 128 (glass). Default 0 (off).
lights: A list of light descriptors, each a list with position (length-3 direction vector or point position), color (length-4 RGBA, 0-1 scale), intensity (numeric, default 1), and directional (logical, default TRUE). When empty or NULL, a single headlight at c(0, 0, 1) is used (the original behaviour).
ambient: Ambient light contribution (0-1). Default 0.3.
contrast: Contrast adjustment applied after shading, before uint8_t conversion. Default 1.0 (no change). Values > 1.0 produce darker darks and lighter highlights (S-curve). Formula: (value - 0.5) * contrast + 0.5, clamped to [0, 1].
fog_enabled: Enable depth cueing (fog). Default FALSE.
fog_start: Z-depth where fog begins (0 = near plane, 1 = far plane). Default 0.
fog_end: Z-depth where fog is fully opaque. Default 1.
fog_color: RGBA fog colour (0-1 scale). Defaults to background_color.
threads: Number of render threads. 0 = auto-detect (use all cores), 1 = single-threaded (deterministic). Default 0. Requires OpenMP at compile time.
clip_planes: A list of clip plane descriptors, each a list with normal (length-3 vector) and offset (numeric). Points satisfying dot(normal, position) + offset >= 0 are kept. Default NULL (no clipping).
ssao_enabled: Enable screen-space ambient occlusion. Default FALSE.
ssao_radius: Screen-space sample radius in pixels. Default 16.
ssao_intensity: Occlusion strength (0-1). Default 0.8.
aa_samples: Anti-aliasing supersampling factor. Renders internally at width * aa_samples x height * aa_samples, then downsamples to the requested size via box averaging. Default 1 (no AA), 2 for 2x2 SSAA, 4 for 4x4.

Value

A render options list for use with render_mesh() or render_scene().

Examples

# Default options
opts <- render_options()

# High-resolution with anti-aliasing and specular highlights
opts <- render_options(width = 1200, height = 900,
    aa_samples = 2L,
    specular_color = c(0.4, 0.4, 0.4, 1),
    shininess = 64)

# Wireframe with transparent background
opts <- render_options(wireframe = TRUE,
    wireframe_color = c(0, 0, 0, 1),
    background_color = c(0, 0, 0, 0))