[Interest] Drawing Frustum on Scene3D

[Mike Krus]

Hi

in Qt 3D you can use a QGeometryRenderer with primitiveType set to Lines (or LineLoop, LineStrip depending on how you structure your data). Checkout https://code.qt.io/cgit/qt/qt3d.git/tree/tests/manual/raycasting-qml/LineEntity.qml


Mike

> On 5 Mar 2021, at 14:16, Alex john <blackbriar153 at gmail.com> wrote:
> 
> But in quick3D that would be done with a class derived from
> QQuick3DGeometry with primitives set to lines
> "setPrimitiveType(QQuick3DGeometry::PrimitiveType::Lines)"
> to construct a cube. Then register that class to qml and use it in
> your View3D. Hope it helps.
> 
> Any alternative to QQuick3DGeometry as I'm using 5.10?
> 
> On Fri, Mar 5, 2021 at 5:00 PM joao morgado <joaodeusmorgado at yahoo.com> wrote:
>> 
>> Hi
>> 
>> That frustum is just a group of lines in cube shape, you see it as a frustum because the camera is in perspective mode.
>> I never used Qt3D so cannot help with scene3d.
>> But in quick3D that would be done with a class derived from QQuick3DGeometry with primitives set to lines "setPrimitiveType(QQuick3DGeometry::PrimitiveType::Lines)"
>> to construct a cube. Then register that class to qml and use it in your View3D. Hope it helps.
>> 
>> João
>> Em sexta-feira, 5 de março de 2021 09:46:15 GMT, Alex john <blackbriar153 at gmail.com> escreveu:
>> 
>> 
>> Hello Qt
>> 
>> I like to render a frustum as here https://imgur.com/a/BzmCQ2D on
>> Scene3d. Can you let me know how it can be done? If I have to get the
>> custom QML ,do I have to get it from the C++ and then push it to the
>> QML context? Any pointers to basic code is appreciated.
>> 
>> Thanks.
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—
Mike Krus | mike.krus at kdab.com | Senior Software Engineer & Teamlead
KDAB (UK) Ltd., a KDAB Group company
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