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rt: simple real-time ray tracing

this uses the vulkan ray tracing extension to path trace a scene. the geometry comes from one or more bvh modules which collect input for bottom level acceleration structures.

the rt module uses hero wavelength spectral sampling for accurate colour reproduction.

(scene: nikita sky demo)

connectors

• output the rendered beauty image
• tex an array connector for input textures, connect to an i-jpglst or i-lut module
• blue blue noise texture as input lut, as those provided by christoph
• irr irradiance buffer, that is: beauty output divided by albedo
• albedo fake diffuse albedo for use with svgf, demodulated from the irradiance buffer
• gbuf packed normal and depth of the first intersection

the tex connector expects an array of input textures, as the i-jpglst module provides, or the i-lut module if you pass a .txt file with a list of filenames.

you can download a blue noise texture from this github issue. this was too large to just ship with the vkdt distribution.

parameters

this still changes so often.. be careful to trust this text.

• cam position, direction, and up vector of the camera
• fog homogeneous global background fog
• spp samples per pixel
• envmap filename of the environment map, 2:1 aspect latitude/longitude, .hdr preferably 8k
• cam mode use custom camera in this module, or grab camera, simulation time, and fog from another module
• cam_mod if cam mode is set to another module, this is the other module's name
• cam_inst if cam mode is set to another module, this is the other module's instance
• sampler choose which path space sampler to use for rendering: path tracing/env-nee, markov chain path guiding
• wd width of the render in pixels
• ht height of the render in pixels