Enum Mesh3DRenderMode 

pub enum Mesh3DRenderMode {
    Flat,
    Wireframe,
    Gouraud,
    Phong,
    NormalDebug,
    DepthDebug,
}

-render MODE value. Selects which surface model the 3D→raster renderer uses when the user pairs a 3D input (.stl/.obj/ .gltf/.glb/.usdz) with a raster output (.png/.jpg/ .bmp/.webp).

Default is Flat — one constant colour per primitive derived from the material’s base_color (or a fallback grey when no material is attached). Gouraud and Phong add per-vertex / per-pixel lighting using either the primitive’s stored vertex normals or face normals computed from the triangle vertices when none are provided. NormalDebug and DepthDebug are diagnostic visualisations that bypass the lighting equation entirely — useful when normals look wrong, a Z-fighting glitch shows up, or the camera framing seems off.

Variants

Flat

Flat-shaded triangles, one colour per primitive (no per-pixel lighting). Cheapest mode and the default.

Wireframe

Wireframe — only triangle edges are drawn, interior pixels stay at the background. Same colour-per-primitive as Flat.

Gouraud

Gouraud — light is evaluated at each vertex using the per-vertex normal, then the resulting RGB is bilinearly interpolated across the triangle. Requires (or computes) one normal per vertex.

Phong

Phong — the per-vertex normal is interpolated across the triangle and the lighting equation is evaluated per pixel. Smoother than Gouraud at the cost of one normalise + dot per fragment.

NormalDebug

NormalDebug — paint each pixel with the world-space interpolated normal mapped into RGB ([r,g,b] = (n + 1) / 2 * 255). Light / camera / material settings are ignored. Useful for inspecting whether per-vertex normals were loaded correctly or whether the face-normal fallback is firing.

DepthDebug

DepthDebug — paint each pixel a grayscale value derived from the interpolated NDC z (near = white, far = black). Light / camera orbit / material settings are ignored; useful for spotting Z-fighting and for picking sane near/far planes.

Implementations

impl Mesh3DRenderMode

pub fn parse(s: &str) -> Result<Mesh3DRenderMode, String>

Parse the value after -render. Accepts case-insensitive flat / wireframe / gouraud / phong / normal-debug / depth-debug. wire is a short alias for wireframe; shaded aliases flat; normal / normals alias normal-debug; depth / z alias depth-debug.

Trait Implementations

impl Clone for Mesh3DRenderMode

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Mesh3DRenderMode

impl Debug for Mesh3DRenderMode

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

Formats the value using the given formatter.

impl Default for Mesh3DRenderMode

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Mesh3DRenderMode

impl PartialEq for Mesh3DRenderMode

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Mesh3DRenderMode