[QGIS-Developer] Rendering simple 3D lines

[Nyall Dawson]

On Wed, 8 Sept 2021 at 13:27, <rnathreddy at sanasw.com> wrote:
>
> Hi,
>
> We are developing a simple 3D viewer to display the DEM and overlay a
> trajectory (vector layer) as a simple 3d lines. It is working fine and
> vector file is draped on to the terrain. We want to display the vector
> file as simple 3d lines.
>
> We could see the same in QGIS application by setting the Vector Layer
> properties 3D View => Render as simple 3D lines.
>
> Trying to set same programmatically, but getting the following error.
>
>     " ..\..\..\src\3d\qgsvectorlayerchunkloader_p.cpp(57) :
>       (QgsVectorLayerChunkLoader::QgsVectorLayerChunkLoader) [15960ms]
> Unknown
>           3D symbol type for vector layer: line  "

Possibly you are missing a call to Qgs3D::initialize() somewhere in
your application startup.

Nyall

>
> The following code snippet used:
>
> if (pcLyr != nullptr) {
>
>    std::unique_ptr< QgsLine3DSymbol > sym = qgis::make_unique<
> QgsLine3DSymbol >();
>    std::unique_ptr< QgsPhongMaterialSettings > mCurrentSettings;
>
>    mCurrentSettings = qgis::make_unique< QgsPhongMaterialSettings >();
>
>    sym->setWidth (1);
>    sym->setHeight (0);
>    sym->setExtrusionHeight(0);
>    sym->setAltitudeClamping(Qgs3DTypes::AltClampAbsolute);
>    sym->setAltitudeBinding(Qgs3DTypes::AltBindVertex);
>    sym->setRenderAsSimpleLines(true);
>    sym->setMaterial(mCurrentSettings->clone());
>
>    QgsVectorLayer3DRenderer *pcR = new QgsVectorLayer3DRenderer
> (sym->clone());
>    pcLyr->setRenderer3D(pcR);
> }
>
>
> Can any one help us in this regard?
>
> Regards
> Raghunath
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