> error[E0308]: mismatched types
  --> src/core/render.rs:245:12
  |
245|   let buffer: Vec<f32> = scene.calculate();
  |               ^^^^^^^^ expected struct 'f32', found 'Vec<f32>'
  = note: expected type 'std::vec::Vec<f32>'
  = found type 'f32'
> help: consider changing this to match the expected type
> help: run 'cargo explain E0308' for more detail