Struct HashField 

pub struct HashField {
    pub grid: HashGrid,
    /* private fields */
}

Instant-NGP style neural field: multi-resolution hash grid + 2-layer MLP.

Architecture:

• HashGrid query → [n_levels * F] features
• Concat with dir_enc → [(n_levels*F) + dir_enc_dim]
• Linear + ReLU → hidden_dim
• Linear → (1 + color_dim)
• sigma = ReLU(output[0]), color_feat = output[1..]

Fields

grid: HashGrid

Multi-resolution hash grid.

Implementations

impl HashField

pub fn new( grid_cfg: HashGridConfig, hidden_dim: usize, dir_enc_dim: usize, color_dim: usize, rng: &mut LcgRng, ) -> NerfResult<Self>

Create a new HashField.

Errors

Returns InvalidHashConfig or InvalidFeatureDim for bad parameters.

pub fn forward( &self, xyz: [f32; 3], dir_enc: &[f32], ) -> NerfResult<(f32, Vec<f32>)>

Query the hash field at a 3D world point with encoded view direction.

Returns (sigma: f32, color_feat: Vec<f32>) where color_feat has color_dim elements.

Errors

Returns DimensionMismatch if dir_enc.len() != dir_enc_dim.

Trait Implementations

impl Clone for HashField

fn clone(&self) -> HashField

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HashField

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.