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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
• blue blue noise texture as input lut, as those provided by christoph
• tex an array connector for input textures, connect to a i-jpglst module
• aov an output buffer containing some arbitary output variables such as fake diffuse albedo or normals

parameters

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

• cam_x position of the camera
• cam_w look-at direction of the camera
• spp samples per pixel