In Qt3D certain properties of rendered objects are not just simply set on the renderer, but they are globally (per view) or locally (on the material of a rendered object) added to the renderPasses - or so is my comprehension at least. (I'm using PySide2 - but the code is almost the same in C++)

For example when adding a geometry-renderer and using its primitive type point (`Qt3DRender.QGeometryRenderer.Point`) instead of rendering triangle-faces it displays the points of the geometry.

Here is an example figure with the default type.

[![enter image description here](https://i.stack.imgur.com/hJfS6m.png)](https://i.stack.imgur.com/hJfS6m.png)

The same only showing the points (`renderer.setPrimitiveType(Qt3DRender.QGeometryRenderer.Points)`)

[![enter image description here](https://i.stack.imgur.com/eYat1m.png)](https://i.stack.imgur.com/eYat1m.png)

Hard to guess, but here the point-size has been already been changed - using the following code:

```
material = Qt3DExtras.QPhongMaterial(e)
for t in material.effect().techniques():
    for rp in t.renderPasses():
        pointSize = Qt3DRender.QPointSize(rp)

        pointSize.setSizeMode(Qt3DRender.QPointSize.SizeMode.Fixed)
        pointSize.setValue(5.0)
        rp.addRenderState(pointSize)

```

According to the documentation the same mechanism can be used to change the line-width when rendering the object with `Lines` (`LineStrip`) as primitive type. Adding

```
    lineWidth = Qt3DRender.QLineWidth(rp)
    lineWidth.setValue(5.)
    lineWidth.setSmooth(True)
    rp.addRenderState(lineWidth)

```

does not change the line-width.

[![enter image description here](https://i.stack.imgur.com/Ukh4Xm.png)](https://i.stack.imgur.com/Ukh4Xm.png)

Why? Where do I need to add QLineWidth? Is it the material I chose which ignores the QLineWidth-state?