### SDF Operations (WGSL)

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Examples of common SDF operations like smooth union, intersection, and subtraction using WGSL.

```APIDOC
## sdf_op_smooth_union

### Description
Smoothly blends two shapes together with adjustable smoothness.

### Method
N/A (WGSL function)

### Endpoint
N/A

### Parameters
#### Query Parameters
- **k** (f32) - Controls smoothness (larger = smoother blend)

### Request Example
```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let sphere = sdf3d_sphere(p - vec3f(0.3, 0.0, 0.0), 0.4);
    let box_ = sdf3d_box(p + vec3f(0.3, 0.0, 0.0), vec3f(0.5, 0.5, 0.5));
    // k=0.2 controls smoothness (larger = smoother blend)
    return sdf_op_smooth_union(sphere, box_, 0.2);
}
```

## sdf_op_smooth_intersection

### Description
Smoothly intersects two shapes, keeping only the overlapping region.

### Method
N/A (WGSL function)

### Endpoint
N/A

### Parameters
#### Query Parameters
- **k** (f32) - Controls smoothness

### Request Example
```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let sphere = sdf3d_sphere(p, 0.6);
    let box_ = sdf3d_box(p, vec3f(0.8, 0.8, 0.8));
    // Smooth intersection with k=0.1
    return sdf_op_smooth_intersection(sphere, box_, 0.1);
}
```

## sdf_op_smooth_subtraction

### Description
Smoothly subtracts one shape from another with rounded edges.

### Method
N/A (WGSL function)

### Endpoint
N/A

### Parameters
#### Query Parameters
- **k** (f32) - Controls smoothness

### Request Example
```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let box_ = sdf3d_box(p, vec3f(0.8, 0.8, 0.8));
    let sphere = sdf3d_sphere(p, 0.5);
    // Subtract sphere from box with smooth edges (k=0.15)
    return sdf_op_smooth_subtraction(sphere, box_, 0.15);
}
```
```

--------------------------------

### WGSL SDF Definition Example

Source: https://github.com/wilstonoreo/sdf2mesh/blob/master/README.md

This WGSL code defines a torus SDF. It imports predefined primitive functions and defines the main `sdf3d` function which takes a 3D point and returns the signed distance.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    return sdf3d_torus(p, vec2(0.5, 0.2));
}
```

--------------------------------

### Mandelbulb Fractal GLSL Shader

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

A GLSL fragment shader example that defines a Mandelbulb fractal SDF. This can be used as input for sdf2mesh.

```glsl
#version 450 core

float sdf(vec3 p) {
    p.xyz = p.xzy;
    vec3 z = p;
    vec3 dz = vec3(0.0);
    float power = 8.0;
    float r, theta, phi;
    float dr = 1.0;

    float t0 = 1.0;
    for(int i = 0; i < 5; ++i) {
        r = length(z);
        if(r > 2.0) continue;
        theta = atan(z.y / z.x);
        phi = asin(z.z / r);
        dr = pow(r, power - 1.0) * dr * power + 1.0;

        r = pow(r, power);
        theta = theta * power;
        phi = phi * power;

        z = r * vec3(cos(theta)*cos(phi), sin(theta)*cos(phi), sin(phi)) + p;

        t0 = min(t0, r);
    }
    return 0.5 * log(r) * r / dr - 0.003;
}

void main() {}
```

--------------------------------

### WGSL Module Imports

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Import specific modules like `sdf3d::*` for all primitives and normal calculation, `sdf::op` for CSG operations, `sdf3d::primitives` for primitives only, or `sdf3d::normal` for normal calculation.

```wgsl
// Import all SDF3D primitives and normal calculation
use sdf3d::*;

// Import only SDF operations (union, intersection, subtraction)
use sdf::op;

// Import only primitives
use sdf3d::primitives;

// Import normal calculation function
use sdf3d::normal;

fn sdf3d(p: vec3f) -> f32 {
    // Your SDF definition here
    return sdf3d_sphere(p, 0.5);
}
```

--------------------------------

### Download and Convert ShaderToy to Mesh

Source: https://github.com/wilstonoreo/sdf2mesh/blob/master/README.md

Use this command to download a ShaderToy shader, convert it from GLSL to WGSL, and generate an STL mesh. The `--shadertoy-sdf` flag allows specifying a custom SDF function name.

```shell
cargo run -- --shadertoy-id XX3Xzl  --resolution 512 --mesh shadertoy.stl --debug-wgsl test.wgsl --bounds 2 --shadertoy-sdf map
```

--------------------------------

### Basic WGSL SDF File Structure

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

A basic WGSL SDF file defines a `sdf3d(p: vec3f) -> f32` function. Module imports are used to access built-in functionality.

```wgsl
// examples/torus.sdf3d - Simple torus with radius 0.5 and tube width 0.2
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    return sdf3d_torus(p, vec2(0.5, 0.2));
}
```

--------------------------------

### Generate Mandelbulb Mesh using sdf2mesh CLI

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Command-line instruction to generate a Mandelbulb mesh from a GLSL SDF file using sdf2mesh. Specify output file, resolution, and bounds.

```bash
# Generate the Mandelbulb mesh
cargo run -- --glsl examples/mandelmesh.frag --resolution 512 --mesh mandelbulb.stl --bounds 5
```

--------------------------------

### Generate Mesh from WGSL SDF File

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Use this command to generate a mesh from a WGSL SDF file. Specify the input SDF file, resolution, and output mesh file. Custom bounding box size and output format (PLY) are supported.

```bash
cargo run -- --sdf examples/torus.sdf3d --resolution 128 --mesh torus.stl
```

```bash
cargo run -- --sdf examples/torus.sdf3d --resolution 256 --mesh torus.stl --bounds 3
```

```bash
cargo run -- --sdf examples/torus.sdf3d --resolution 128 --mesh torus.ply
```

```bash
cargo run -- --sdf examples/torus.sdf3d --resolution 128 --mesh torus.stl --debug-wgsl debug.wgsl
```

```bash
cargo run -- --sdf examples/torus.sdf3d --resolution 128 --mesh torus.stl --debug-png slices/
```

--------------------------------

### Generate Mesh from SDF File

Source: https://github.com/wilstonoreo/sdf2mesh/blob/master/README.md

Use this command to generate a mesh from a WGSL SDF file. Specify the SDF file, desired resolution, and output mesh file name.

```shell
cargo run -- --sdf examples/torus.sdf3d  --resolution 128 --mesh torus.stl
```

--------------------------------

### sdf3d_box Primitive

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines an axis-aligned box centered at the origin. Requires `use sdf3d::*;`.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    // Box with dimensions 1.0 x 0.5 x 0.3
    return sdf3d_box(p, vec3f(1.0, 0.5, 0.3));
}
```

--------------------------------

### sdf3d_sphere Primitive

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines a sphere centered at the origin. Requires `use sdf3d::*;`.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    // Sphere with radius 0.5
    return sdf3d_sphere(p, 0.5);
}
```

--------------------------------

### Generate Mesh from ShaderToy

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Fetch shaders directly from ShaderToy and convert them to meshes. Requires public + API visibility. Specify the ShaderToy ID, resolution, output mesh, and bounds. Custom SDF function names are supported.

```bash
cargo run -- --shadertoy-id DldfR7 --resolution 256 --mesh shadertoy.stl --bounds 5
```

```bash
cargo run -- --shadertoy-id XX3Xzl --resolution 512 --mesh torusknot.stl --bounds 2 --shadertoy-sdf map
```

```bash
cargo run -- --shadertoy-id XX3Xzl --resolution 256 --mesh output.stl --debug-wgsl converted.wgsl --bounds 2 --shadertoy-sdf map
```

--------------------------------

### sdf3d_torus Primitive

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines a torus centered at the origin, lying in the XZ plane. Requires `use sdf3d::*;`.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    // Torus with major radius 0.5 and minor radius (tube) 0.2
    return sdf3d_torus(p, vec2(0.5, 0.2));
}
```

--------------------------------

### Rust 3D Bounding Box Utility

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines 3D bounding boxes to limit SDF evaluation domains. Supports creation from size/center, explicit corners, and provides methods to access properties and check point containment.

```rust
use sdf2mesh::{Bounds3D, Vec3D};

// Create a centered cube bounding box
let bounds = Bounds3D::centered_cube(2.0);  // 2x2x2 cube centered at origin

// Create a bounding box with explicit size and center
let bounds = Bounds3D::cube(3.0, &Vec3D::new(0.0, 0.5, 0.0));

// Create from min/max corners
let bounds = Bounds3D::min_max(
    Vec3D::new(-1.0, -1.0, -1.0),
    Vec3D::new(1.0, 1.0, 1.0)
);

// Access bounding box properties
let min = bounds.min();
let max = bounds.max();
let size = bounds.size();
let center = bounds.center();

// Check if a point is inside the bounds
let inside = bounds.contains(&Vec3D::new(0.5, 0.5, 0.5));
```

--------------------------------

### Generate Mesh from ShaderToy ID

Source: https://github.com/wilstonoreo/sdf2mesh/blob/master/README.md

Generate a mesh directly from a ShaderToy ID. Provide the ShaderToy ID, resolution, output mesh file, and bounds.

```shell
cargo run -- --shadertoy-id DldfR7 --resolution 256 --mesh shadertoy.stl --bounds 5
```

--------------------------------

### sdf3d_cylinder Primitive

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines a cylinder centered at the origin, aligned with the Y-axis. Requires `use sdf3d::*;`.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    // Cylinder with height 1.0 and radius 0.3
    return sdf3d_cylinder(p, 1.0, 0.3);
}
```

--------------------------------

### Rust Load SDF Shader

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Loads SDF shaders from various sources including files, GLSL fragments, and the ShaderToy API. Ensure the correct SDF function name is provided when loading from GLSL or ShaderToy.

```rust
use sdf2mesh::shader::Sdf3DShader;

// Load from a .sdf3d file
let shader = Sdf3DShader::from_path("examples/torus.sdf3d");

// Load from a GLSL fragment shader
let shader = Sdf3DShader::from_glsl_fragment_shader(
    "examples/mandelmesh.frag",
    "sdf"  // name of the SDF function
).unwrap();

// Load from ShaderToy API (async)
let shader = Sdf3DShader::from_shadertoy_api(
    "DldfR7",  // ShaderToy shader ID
    "sdf"      // name of the SDF function
).await.unwrap();

// Write compiled WGSL to file for debugging
shader.write_to_file("debug.wgsl").unwrap();

// Create wgpu shader module
let device: wgpu::Device = /* ... */;
let shader_module = shader.create_shader_module(&device);
```

--------------------------------

### Generate Mesh from GLSL Fragment Shader

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Convert GLSL fragment shaders to meshes. Specify the GLSL file, resolution, output mesh, and bounds. A custom SDF function name can also be provided.

```bash
cargo run -- --glsl examples/mandelmesh.frag --resolution 512 --mesh mandelmesh.stl --bounds 5
```

```bash
cargo run -- --glsl examples/mandelmesh.frag --resolution 256 --mesh output.stl --bounds 4 --glsl-sdf myDistanceFunction
```

--------------------------------

### sdf3d_capsule Primitive

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Defines a capsule (line segment with rounded ends) between two points. Requires `use sdf3d::*;`.

```wgsl
use sdf3d::*;

fn sdf3d(p: vec3f) -> f32 {
    // Capsule from point A to point B with radius 0.2
    let a = vec3f(0.0, -0.5, 0.0);
    let b = vec3f(0.0, 0.5, 0.0);
    return sdf3d_capsule(p, a, b, 0.2);
}
```

--------------------------------

### Bounds3D API

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Utility for defining 3D bounding boxes used to limit the SDF evaluation domain.

```APIDOC
## Bounds3D

### Description
Utility for defining 3D bounding boxes used to limit the SDF evaluation domain.

### Methods
- `centered_cube(size: f64)`: Create a centered cube bounding box.
- `cube(size: f64, center: &Vec3D)`: Create a bounding box with explicit size and center.
- `min_max(min: Vec3D, max: Vec3D)`: Create from min/max corners.
- `min()`: Get the minimum corner.
- `max()`: Get the maximum corner.
- `size()`: Get the size of the bounding box.
- `center()`: Get the center of the bounding box.
- `contains(point: &Vec3D)`: Check if a point is inside the bounds.

### Request Example
```rust
use sdf2mesh::{Bounds3D, Vec3D};

// Create a centered cube bounding box
let bounds = Bounds3D::centered_cube(2.0);  // 2x2x2 cube centered at origin

// Create a bounding box with explicit size and center
let bounds = Bounds3D::cube(3.0, &Vec3D::new(0.0, 0.5, 0.0));

// Create from min/max corners
let bounds = Bounds3D::min_max(
    Vec3D::new(-1.0, -1.0, -1.0),
    Vec3D::new(1.0, 1.0, 1.0)
);

// Access bounding box properties
let min = bounds.min();
let max = bounds.max();
let size = bounds.size();
let center = bounds.center();

// Check if a point is inside the bounds
let inside = bounds.contains(&Vec3D::new(0.5, 0.5, 0.5));
```
```

--------------------------------

### Generate Mesh from GLSL Shader

Source: https://github.com/wilstonoreo/sdf2mesh/blob/master/README.md

Generate a mesh from a GLSL fragment shader. Ensure the shader includes a SDF function with the signature `float (vec3)`. Specify the GLSL file, resolution, output mesh file, and bounds.

```shell
cargo run -- --glsl .\examples\mandelmesh.frag --resolution 512 --mesh mandelmesh.stl --bounds 5
```

--------------------------------

### Rust Triangle Mesh Creation and Export

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Represents a triangle mesh and handles its export to various file formats. VertexList is used to collect vertices during the dual contouring process.

```rust
use sdf2mesh::mesh::{TriangleMesh, VertexList};
use sdf2mesh::Vertex;

// VertexList collects vertices during dual contouring
let mut vertex_list = VertexList::with_capacity(1024 * 1024);

// Insert vertices with cell coordinates, sign changes, and vertex data
vertex_list.insert(
    (x, y, z),                           // cell coordinates (u16, u16, u16)
    (sign_x, sign_y, sign_z, sign_w),    // sign changes (bool, bool, bool, bool)
    Vertex {
        pos: Vec3D::new(px, py, pz),
        normal: Vec3D::new(nx, ny, nz),
    }
);

// Convert to triangle mesh
let mesh = TriangleMesh::from(vertex_list);

// Export to file (format detected from extension)
mesh.write_to_file("output.stl").unwrap();  // STL format
mesh.write_to_file("output.ply").unwrap();  // PLY format
```

--------------------------------

### Rust GPU Texture Storage for Compute Shaders

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Provides GPU texture storage for compute shader output, specifically for dual contouring. Includes methods for creating textures, accessing bind group information, copying data to CPU buffers, and saving as PNG.

```rust
use sdf2mesh::texture::Rgba32FloatTextureStorage;

// Create texture storage for compute shader output
let device: wgpu::Device = /* ... */;
let dims = (256, 256);  // Width x Height

let normal_texture = Rgba32FloatTextureStorage::new(&device, dims, 1);  // binding 1
let position_texture = Rgba32FloatTextureStorage::new(&device, dims, 2);  // binding 2

// Get bind group layout and entries for shader binding
let layout_entry = normal_texture.bind_group_layout_entry();
let bind_entry = normal_texture.bind_group_entry();

// After compute shader execution, copy texture to CPU-readable buffer
let mut encoder: wgpu::CommandEncoder = /* ... */;
normal_texture.copy_texture_to_buffer(&mut encoder);

// Map buffer and read data
normal_texture.map_buffer(&device).await;
let rgba = normal_texture.get_rgba(x, y);  // Returns (f32, f32, f32, f32)

// Save as PNG for debugging
use sdf2mesh::png::ToPngFile;
normal_texture.to_png_file("debug_normal.png");
```

--------------------------------

### Sdf3DShader API

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

API for loading and processing SDF shaders from various sources using the Sdf3DShader struct.

```APIDOC
## Sdf3DShader

### Description
Main struct for loading and processing SDF shaders from various sources.

### Methods
- `from_path(path: &str)`: Load from a .sdf3d file.
- `from_glsl_fragment_shader(path: &str, function_name: &str)`: Load from a GLSL fragment shader.
- `from_shadertoy_api(shader_id: &str, function_name: &str)`: Load from ShaderToy API (async).
- `write_to_file(path: &str)`: Write compiled WGSL to file for debugging.
- `create_shader_module(device: &wgpu::Device)`: Create wgpu shader module.

### Request Example
```rust
use sdf2mesh::shader::Sdf3DShader;

// Load from a .sdf3d file
let shader = Sdf3DShader::from_path("examples/torus.sdf3d");

// Load from a GLSL fragment shader
let shader = Sdf3DShader::from_glsl_fragment_shader(
    "examples/mandelmesh.frag",
    "sdf"  // name of the SDF function
).unwrap();

// Load from ShaderToy API (async)
let shader = Sdf3DShader::from_shadertoy_api(
    "DldfR7",  // ShaderToy shader ID
    "sdf"      // name of the SDF function
).await.unwrap();

// Write compiled WGSL to file for debugging
shader.write_to_file("debug.wgsl").unwrap();

// Create wgpu shader module
let device: wgpu::Device = /* ... */;
let shader_module = shader.create_shader_module(&device);
```
```

--------------------------------

### TriangleMesh API

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

API for representing and exporting triangle meshes generated by the library.

```APIDOC
## TriangleMesh

### Description
Represents the output triangle mesh and handles file export.

### Methods
- `from(vertex_list: VertexList)`: Convert from VertexList to TriangleMesh.
- `write_to_file(path: &str)`: Export to file (format detected from extension).

### VertexList

#### Description
Collects vertices during dual contouring.

#### Methods
- `with_capacity(capacity: usize)`: Create a new VertexList with specified capacity.
- `insert(cell_coords: (u16, u16, u16), sign_changes: (bool, bool, bool, bool), vertex_data: Vertex)`: Insert vertices.

### Request Example
```rust
use sdf2mesh::mesh::{TriangleMesh, VertexList};
use sdf2mesh::Vertex;

// VertexList collects vertices during dual contouring
let mut vertex_list = VertexList::with_capacity(1024 * 1024);

// Insert vertices with cell coordinates, sign changes, and vertex data
vertex_list.insert(
    (x, y, z),                           // cell coordinates (u16, u16, u16)
    (sign_x, sign_y, sign_z, sign_w),    // sign changes (bool, bool, bool, bool)
    Vertex {
        pos: Vec3D::new(px, py, pz),
        normal: Vec3D::new(nx, ny, nz),
    }
);

// Convert to triangle mesh
let mesh = TriangleMesh::from(vertex_list);

// Export to file (format detected from extension)
mesh.write_to_file("output.stl").unwrap();  // STL format
mesh.write_to_file("output.ply").unwrap();  // PLY format
```
```

--------------------------------

### Rgba32FloatTextureStorage API

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

GPU texture storage for compute shader output during dual contouring.

```APIDOC
## Rgba32FloatTextureStorage

### Description
GPU texture storage for compute shader output during dual contouring.

### Methods
- `new(device: &wgpu::Device, dims: (u32, u32), binding: u32)`: Create texture storage.
- `bind_group_layout_entry()`: Get bind group layout entry.
- `bind_group_entry()`: Get bind group entry.
- `copy_texture_to_buffer(encoder: &mut wgpu::CommandEncoder)`: Copy texture to CPU-readable buffer.
- `map_buffer(device: &wgpu::Device)`: Map buffer for reading (async).
- `get_rgba(x: u32, y: u32)`: Get RGBA values at specified coordinates.
- `to_png_file(path: &str)`: Save texture as PNG for debugging.

### Request Example
```rust
use sdf2mesh::texture::Rgba32FloatTextureStorage;

// Create texture storage for compute shader output
let device: wgpu::Device = /* ... */;
let dims = (256, 256);  // Width x Height

let normal_texture = Rgba32FloatTextureStorage::new(&device, dims, 1);  // binding 1
let position_texture = Rgba32FloatTextureStorage::new(&device, dims, 2);  // binding 2

// Get bind group layout and entries for shader binding
let layout_entry = normal_texture.bind_group_layout_entry();
let bind_entry = normal_texture.bind_group_entry();

// After compute shader execution, copy texture to CPU-readable buffer
let mut encoder: wgpu::CommandEncoder = /* ... */;
normal_texture.copy_texture_to_buffer(&mut encoder);

// Map buffer and read data
normal_texture.map_buffer(&device).await;
let rgba = normal_texture.get_rgba(x, y);  // Returns (f32, f32, f32, f32)

// Save as PNG for debugging
use sdf2mesh::png::ToPngFile;
normal_texture.to_png_file("debug_normal.png");
```
```

--------------------------------

### WGSL Smooth Union SDF Operation

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Smoothly blends two shapes together. The 'k' parameter controls the smoothness of the blend; larger values result in a smoother transition.

```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let sphere = sdf3d_sphere(p - vec3f(0.3, 0.0, 0.0), 0.4);
    let box_ = sdf3d_box(p + vec3f(0.3, 0.0, 0.0), vec3f(0.5, 0.5, 0.5));
    // k=0.2 controls smoothness (larger = smoother blend)
    return sdf_op_smooth_union(sphere, box_, 0.2);
}
```

--------------------------------

### WGSL Smooth Subtraction SDF Operation

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Smoothly subtracts one shape from another, creating rounded edges. The 'k' value controls the edge rounding; a larger 'k' results in a smoother subtraction.

```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let box_ = sdf3d_box(p, vec3f(0.8, 0.8, 0.8));
    let sphere = sdf3d_sphere(p, 0.5);
    // Subtract sphere from box with smooth edges (k=0.15)
    return sdf_op_smooth_subtraction(sphere, box_, 0.15);
}
```

--------------------------------

### WGSL Smooth Intersection SDF Operation

Source: https://context7.com/wilstonoreo/sdf2mesh/llms.txt

Smoothly intersects two shapes, retaining only the overlapping region. The 'k' parameter determines the smoothness of the intersection boundary.

```wgsl
use sdf3d::*
use sdf::op;

fn sdf3d(p: vec3f) -> f32 {
    let sphere = sdf3d_sphere(p, 0.6);
    let box_ = sdf3d_box(p, vec3f(0.8, 0.8, 0.8));
    // Smooth intersection with k=0.1
    return sdf_op_smooth_intersection(sphere, box_, 0.1);
}
```

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