Struct gltf_json::extensions::texture::TextureTransform

pub struct TextureTransform {
    pub offset: TextureTransformOffset,
    pub rotation: TextureTransformRotation,
    pub scale: TextureTransformScale,
    pub tex_coord: Option<u32>,
    pub extras: Extras,
}

Many techniques can be used to optimize resource usage for a 3d scene. Chief among them is the ability to minimize the number of textures the GPU must load. To achieve this, many engines encourage packing many objects’ low-resolution textures into a single large texture atlas. The region of the resulting atlas that corresponds with each object is then defined by vertical and horizontal offsets, and the width and height of the region.

To support this use case, this extension adds offset, rotation, and scale properties to textureInfo structures. These properties would typically be implemented as an affine transform on the UV coordinates.

Fields

offset: TextureTransformOffset

rotation: TextureTransformRotation

Rotate the UVs by this many radians counter-clockwise around the origin. This is equivalent to a similar rotation of the image clockwise.

scale: TextureTransformScale

The scale factor applied to the components of the UV coordinates.

tex_coord: Option<u32>

Overrides the textureInfo texCoord value if supplied, and if this extension is supported.

extras: Extras

Optional application specific data.

Trait Implementations

impl Clone for TextureTransform

fn clone(&self) -> TextureTransform

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TextureTransform

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

Formats the value using the given formatter.

impl Default for TextureTransform

fn default() -> TextureTransform

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TextureTransform

where TextureTransform: Default,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for TextureTransform

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Validate for TextureTransform

fn validate<P, R>(&self, _root: &Root, _path: P, _report: &mut R)

where P: Fn() -> Path, R: FnMut(&dyn Fn() -> Path, Error),

Validates the invariants required for the library to function safely.