Qt3D动态纹理 [英] Qt3D dynamic texture

问题描述

我正在开发包含Qt3D视图的软件. 此3D视图使我们能够可视化元素.对象的所有渲染部分都是使用自定义材质/着色器在QML中完成的.

I'm working on software that contains a Qt3D view. This 3D view allow us to visualize elements. All the rendering part of the object is done in QML with custom materials/shaders.

我能够创建将纹理传递到着色器进行纹理化的材质.包含纹理的QML对象是Texture2D(其c ++实现是 QTexture2D )

I am able to create a material that passes a texture to a shader for texturing. The QML object holding the texture is Texture2D (its c++ implementation is QTexture2D )

我的问题是我找不到动态改变纹理内容的方法. 在该软件中，用户可以从光盘加载任何图像.我可以从该图像正确创建一个QImage实例.

My problem is that I don't find a way to dynamically change the texture content. In the software, the user can load any image from disc. I can properly create a QImage instance from this image.

所以问题是: 我在C ++中有一个QImage实例，我想将其转换为QTexture2D实例，以便可以将其传递给QML端.

So the question is: I have a QImage instance in c++ and I want to convert it to a QTexture2D instance so that I can pass it to the QML side.

我该怎么做?

我已经研究过QAbstractTexture和QAbstractTextureImage类(及其子类)，但是找不到从QImage创建任何此类的方法

I already looked into the QAbstractTexture and QAbstractTextureImage classes (and their children) but can't find a way to create any of these from a QImage

推荐答案

好久了，这是我使用的解决方案:

Well, after a long time, here is the solution I used:

仅在c ++中存储包含纹理路径的QString，并在QML中创建所有Texture对象. QML看起来像这样:

Only store a QString containing the path to the texture in c++ and create all the Texture object in QML. The QML looks like this:

MyDynamicTextureMaterial { // Custom material passing a Texture2D to the shader
    id: myMaterial

    texture: Texture2D {
        id: myTexture
        minificationFilter: Texture.Linear
        magnificationFilter: Texture.Linear
        wrapMode {
            x: WrapMode.Repeat
            y: WrapMode.Repeat
        }
        maximumAnisotropy: 16.0
        TextureImage {
            id: textureImage
            layer: 0
            mipLevel: 0
            source: cppObjectReference.texturePath ? cppObjectReference.texturePath : ""
        }
    }
}

cppObjectReference是对我创建的cpp对象的引用.该对象仅需要QString类型的属性，该属性具有读取"，写入"和通知"选项

cppObjectReference is a reference to a cpp object I created. This object simply needs a property of type QString with Read, Write and Notify options

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