bonsai-rt

Searchable documentation is available at https://calebmanning.net/bonsai-rt/.

A fairly simple spectral renderer using vulkan ray acceleration. Supports diffuse, dieletric and conductive materials.

Example scene

Cornell Box

Cornell Box Scene

Scene Format

Settings

• internal_color_mode - determines how color are represented internally "xyz_d65" or "approx_xyz_d65"
• integrator - "nne"
• max_depth - determines how many times light rays bounce in the scene per sample
• n_samples - determines the number of samples per pixel
• width - width of the output image
• height - height of the output image

Camera

• type - "pinhole"
• position - position of the center of the camera
• direction - the direction the camera is facing
• up - the direction that is considered up in the scene
• size - the fov of the camera

Objects

An array of objects in the scene fields are

• material_name - the name of the material used to shader this object must match a material in the materials array
• obj_file - relative path of the object file
• transform - a 4 by 4 matrix representing the transform applied to the object to take it from object space to world space

Materials

An array of materials used by objects and lights fields are

• material_name - the name of the material used to reference it in lights and objects arrays
• type - "diffuse", "conductive", "dielectric", "emissive"
• color - linear rgb color of the material
• ior - index of refraction of the material
• ec - extinction coefficient of the material

lights

An array of lights in the scene fields are

• type - "object"
• material_name - the name of the material used to shader this light must match a material in the materials array
• obj_file - relative path of the object file
• transform - a 4 by 4 matrix representing the transform applied to the light to take it from object space to world space