Generate Array
A sequence of numbers becomes a rotating line drawing in space. Glow and a long exposure turn its changing geometry into luminous traces.
Arraygen evaluates an expression on the CPU, using i for each array element and pos for playback position. The 300 resulting values describe 100 XYZ vertices. Array to buffer transfers those values to the GPU, and Pointcloud to mesh makes geometry that Model display draws in Lines mode.
A procedural sine warp gradient colors the drawing. An LFO rotates it, while bloom brightens its highlights and Long Exposure retains earlier images. The visible trail therefore contains previous rendered frames, not additional vertices in the current mesh.
Try it
Start playback and edit the expression to change the distribution of points. Keep complete XYZ triples and the Array to buffer type set to Float32; see Geometry and buffer utilities if you change the layout.
Slow the LFO, then vary Long Exposure’s discharge rate. One changes how fast the drawing moves; the other changes how long the image remembers it.
No external asset is required. This is native Model display rendering, not Qt Quick 3D. The saved Window uses an HDR swapchain format: use a compatible HDR output, or change the Window format and adapt the final image for an SDR display.
Learn more
- Math expressions - Expression-based value generation
- ISF Shaders - Interactive Shader Format for GPU effects
- LFO - Low-frequency oscillator for animation
- Model display - 3D mesh rendering process
- Graphics pipeline - How rendering works in ossia score