Qt3D Core
Qt3D Core
Core elements
The Core exposes a few default elements that make up all Qt3D scenes.
Node
A base Qt3D element.
Entity
An Entity is a Node which has a list of Component properties. This is the type of elements that are actually rendered.
Component
Components are elements that are used to further specify an Entity.
Transformations
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- Transform
A Component that contains a list of transformation
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- LookAtTransform
Performs a LookAtTransform.
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- MatrixTransform
Performs a transformation based on the Matrix provided.
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- TranslateTransform
Performs a translation.
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- RotateTransform
Performs a rotation around an axis.
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- ScaleTransform
Performs a scaling.
Others Components
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- CameraLens
Contains the lens properties of a Camera.- Projection Type
- Far plane
- Near plane
- Field of view
- Aspect ratio
Custom elements
Custom elements can be created by subclassing an Entity and predefining a set of properties.
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- Camera
The Camera elements is an Entity that contains a Transform and a CameraLens.
Resources Management
To achieve high rendering performances, the memory access to the resources has to be properly managed and structured. Therefore, a set of templated resources management oriented classes have been developed in the core of Qt3D.
- QHandle
- QArrayResourcesManager
- QListResourcesManager
The use of a Handle systems allows for resources to be easily accessed and managed while allowing for memory structure to be realigned so as to maintain a contiguous memory alignment and reduce fragmentation.
This should lower the amount of cache misses and speed up rendering.
Other Resources management oriented classes include :
- QCircularBuffer
- QBoundedCircularBuffer