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I am trying to create a 3D View in QGIS 3.6.0, but the buttons for data defined parameters (e.g., width or height) are missing in the Layer Properties dialog (see screenshow below)

screenshot layer properties

I want to set the extrusion and width of my Line geometries according to feature attributes.

Can this be a bug, or am I missing something?

1 Answer 1

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Data defined override (expression) button is not supported in polyline and point layers, but available in polygon layer:

For Polygon:

enter image description here

For Polyline:

enter image description here

For Point:

enter image description here

This means you cannot use Data defined override (expression) for your line layer.

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  • Thanks, I thought so, although I do not fully understand the reason for this. My use case would be the visualization of traffic flows in a street network.
    – Roland
    Commented Jun 24, 2019 at 11:25
  • I also do not know the reason. Maybe it will be added in the future since 3D rendering is new to QGIS 3.
    – ahmadhanb
    Commented Jun 24, 2019 at 11:27
  • Here's the github commit that added the data-defined polygon heights: github.com/qgis/QGIS/commit/… Maybe this is a roadmap for how to add it for other geometries.
    – Dave X
    Commented Nov 19, 2020 at 2:30

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