Render Layers

[huntfx]

Since density maps are recorded alongside the movement maps, it's possible to combine the data and use the density map as an alpha channel.

Instead of adding in a duplicate set of options in the GUI specifically for this, a basic layer system would be a lot more adaptable.
Each layer should get its own render settings with a simple blend mode (eg. replace, add, max, multiply), channels and opacity.
The render options should then give the necessary control to adjust the image similar to how "levels" in Photoshop works.

It'll be hidden behind the "show advanced" checkbox as the complexity won't be needed in 99% of cases.

Examples:

• Movement with alpha (above image)
  Background: Mouse Movement
  Layer 1: Mouse Density, blur: 0, clipping: 0.85, contrast: 0.5, blend mode: multiply, channels: alpha

• Separate colours per click (see Click heatmap with different colour per mouse button #30)
  Background: Mouse Clicks, LMB only, colour map: BlackToRed
  Layer 1: Mouse Clicks, RMB only, colour map: BlackToGreen, blend mode: add
  Layer 2: Mouse Clicks, MMB only, colour map: BlackToBlue, blend mode: add

[huntfx]

Did a brief mockup to demonstrate how it might look.

Blending Modes: Overlay, Replace, Add, Subtract, Multiply, Divide, Maximum, Minimum