Model QML Type

The model can load static meshes from storage or one of the built-in primitive types. The mesh format used is a run-time format that's native to the engine, but additional formats are supported through the asset import tool Balsam.

The built-in primitives can be loaded by setting the source property to one of these values: #Rectangle, #Sphere, #Cube, #Cylinder or #Cone.

Model {
    source: "#Sphere"
}

Custom geometry▲

A model can consist of several sub-meshes, each of which can have its own material. The sub-mesh uses a material from the materials list, corresponding to its index. If the number of materials is less than the sub-meshes, the last material in the list is used for subsequent sub-meshes. This is demonstrated in the Sub-mesh example.

There are currently three different materials that can be used with the model item, the PrincipledMaterial, the DefaultMaterial, and the CustomMaterial.

Picking is the process of sending a ray through the scene from some starting position to find which model(s) intersects with the ray. In QtQuick3D the ray is normally sent from the view using 2D coordinates resulting from a touch or mouse event. If a model was hit by the ray a PickResult will be returned with a handle to the model and information about where the ray hit the model. For models that use custom geometry the picking is less accurate then for static mesh data, as picking is only done against the models bounding volume. If the ray goes through more then one model, the closest pickable model is selected.

Note that models are not pickable by default, so to be able to pick a model in the scene, the model will need to make it self discoverable by setting the pickable property to true. Visit the Qt Quick 3D - Picking example to see how picking can be enabled.

When this property is set to a valid, enabled BakedLightmap object, the model will get a lightmap generated when baking lighting, the lightmap is then stored persistently. When rendering, the model will load and use the associated lightmap. The default value is null.

For more information on how to bake lightmaps, see the Lightmapper documentation.

This property is relevant both when baking and when using lightmaps. A consistent state between the baking run and the subsequent runs that use the generated data is essential. For example, changing the lightmap key will make it impossible to load the previously generated data. An exception is enabled, which can be used to dynamically toggle the usage of lightmaps (outside of the baking run), but be aware that the rendered results will depend on the Lights' bakeMode settings in the scene.

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The bounds of the model descibes the extents of the bounding volume around the model.

When this property is set to true, the model is rendered by reflection probes and can be seen in the reflections.

This property was introduced in Qt 6.4.

When this property is true, the geometry of this model is used when rendering to the shadow maps, and is also generating shadows in baked lighting.

The default value is true.

Holds the depth bias of the model. Depth bias is added to the object distance from camera when sorting objects. This can be used to force rendering order between objects close to each other, that might otherwise be rendered in different order in different frames. Negative values cause the sorting value to move closer to the camera while positive values move it further from the camera.

Specify a custom geometry for the model. The Model::source must be empty when custom geometry is used.

This property defines the origin of the instance’s coordinate system.

See the overview documentation for a detailed explanation.

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If this property is set, the model will not be rendered normally. Instead, a number of instances of the model will be rendered, as defined by the instance table.

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This property contains a list of Inverse Bind Pose matrixes used for the skeletal animation. Each inverseBindPose matrix means the inverse of the global transform of the repective Joint::index in skeleton, which will be used initially.

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Defines the approximate size of the lightmap for this model. The default value is 1024, indicating 1024x1024 as the base size. The actual size of the lightmap texture is likely to be different, often bigger, depending on the mesh.

For simpler, smaller meshes, or when it is known that using a bigger lightmap is unnecessary, the value can be set to something smaller, for example, 512 or 256.

The minimum value is 128.

This setting applies both to persistently stored and for intermediate, partial lightmaps. When baking lightmaps, all models that have usedInBakedLighting enabled are part of the path-traced scene. Thus all of them need to have lightmap UV unwrapping performed and the rasterization steps necessary to compute direct lighting which then can be taken into account for indirect light bounces in the scene. However, for models that just contribute to, but do not store a lightmap the default value is often sufficient. Fine-tuning is more relevant for models that store and then use the generated lightmaps.

This property is relevant only when baking lightmaps. It has no effect afterwards, when using the generated lightmaps during rendering.

Models that have lightmap UV data pre-generated during asset import time (e.g. via the balsam tool) will ignore this property because the lightmap UV unwrapping and the lightmap size hint evaluation have already been done, and will not be performed again during lightmap baking.

This property contains a list of materials used to render the provided geometry. To render anything, there must be at least one material. Normally there should be one material for each sub-mesh included in the source geometry.

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This property contains a list of MorphTargets used to render the provided geometry. Meshes should have at least one attribute among positions, normals, tangent, bitangent for the morph targets. Quick3D supports maximum 8 morph targets and remains will be ignored.

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This property controls whether the model is pickable or not. Set this property to true to make the model pickable. Models are not pickable by default.

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When this property is set to true, the model's materials take reflections contribution from a reflection probe. If the model is inside more than one reflection probe at the same time, the nearest reflection probe is taken into account.

When this property is set to true, the model's materials take shadow contribution from shadow casting lights into account.

The default value is true.

Contains the skeleton for the model. The Skeleton is used together with inverseBindPoses for skinning.

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Contains the skeleton for the model. The Skeleton is used for skinning.

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This property defines the location of the mesh file containing the geometry of this Model or one of the built-in primitive meshes listed below as described in Mesh format and built-in primitives.

• "#Rectangle"

• "#Sphere"

• "#Cube"

• "#Cone"

• "#Cylinder"

When this property is set to true, the model contributes to baked lighting, such as lightmaps, for example in form of casting shadows or indirect light. This setting is independent of controlling lightmap generation for the model, use bakedLightmap for that.

The default value is false.

For more information on how to bake lightmaps, see the Lightmapper documentation.

This property is relevant only when baking lightmaps. It has no effect afterwards, when using the generated lightmaps during rendering.

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