在 LibGDX 中从 ModelBuilder 合并模型

问题描述

我是 LibGDX 3D 设施的新手，我想知道如何合并使用 ModelBuilder#createCylinder 类.我有两个模型实例:

I'm a new to LibGDX 3D facilities and I'm wondering how I can merge two cylinders created using the ModelBuilder#createCylinder class.I have two ModelInstances :

• 第一个是白色圆柱体，
• 第二个具有相同属性的红色圆柱体

如何让只渲染一个圆柱体(实例/模型/对象/任何可以渲染的东西)由白色上面的红色组成(反之亦然).

How can get only one cylinder to render (instance / model / object / whatever can be rendered) composed of the red above the white one (or vice versa).

Pixmap pixmap1 = new Pixmap(1, 1, Format.RGBA8888);
pixmap1.setColor(Color.WHITE);
pixmap1.fill();
Texture white = new Texture(pixmap1);
//...
Texture red = new Texture(pixmap2);

model1 = modelBuilder.createCylinder(4f, 6f, 4f, 16,
        new Material(
                TextureAttribute.createDiffuse(white),
                ColorAttribute.createSpecular(1,1,1,1),
                FloatAttribute.createShininess(8f))
        , Usage.Position | Usage.Normal | Usage.TextureCoordinates);
model1I_white = new ModelInstance(model1, 0, 0, 0);
//...
model2I_red = new ModelInstance(model2, 0, 0, -2f);

然后我用 ModelBatch#render.

推荐答案

您可以使用 MeshBuilder 类创建 2 个圆柱体，并使用 part() 组合您的最终圆柱体，而不是使用 createCylinder().

Instead of using createCylinder(), you can create 2 cylinders with the MeshBuilder class, and compose your final cylinder with part().

meshBuilder.begin();
meshBuilder.cylinder(4f, 6f, 4f, 16);
Mesh cylinder1 = meshBuilder.end();

meshBuilder.begin();
meshBuilder.cylinder(4f, 6f, 4f, 16);
Mesh cylinder2 = meshBuilder.end();


modelBuilder.begin();

modelBuilder.part("cylinder1",
    cylinder1,
    Usage.Position | Usage.Normal | Usage.TextureCoordinates,
    new Material(
        TextureAttribute.createDiffuse(white),
        ColorAttribute.createSpecular(1,1,1,1),
        FloatAttribute.createShininess(8f)));

modelBuilder.part("cylinder2",
    cylinder2,
    Usage.Position | Usage.Normal | Usage.TextureCoordinates,
    new Material(
        TextureAttribute.createDiffuse(red),
        ColorAttribute.createSpecular(1,1,1,1),
        FloatAttribute.createShininess(8f)))
    .mesh.transform(new Matrix4().translate(0, 0, -2f));

Model finalCylinder = modelBuilder.end();

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