绘制网格和纹理libgdx [英] Drawing a Mesh and a Texture libgdx

问题描述

  private Mesh mesh;
  private Texture texture;

  private SpriteBatch batch;

  @Override
  public void create() {
    if (mesh == null) {
      mesh = new Mesh(true, 3, 3, new VertexAttribute(Usage.Position, 3,
          "a_position"));

      mesh.setVertices(new float[] { -0.5f, -0.5f, 0, 
          0.5f, -0.5f, 0, 
          0, 0.5f, 0 });

      mesh.setIndices(new short[] { 0, 1, 2 });

      texture = new Texture(Gdx.files.internal("data/circle.png"));

      batch = new SpriteBatch();
    }

  }

  @Override
  public void render() {
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

    batch.begin();

    mesh.render(GL10.GL_TRIANGLES, 0, 3);
    batch.draw(texture, 10, 10);

    batch.end();

  }

我想在屏幕上画一个三角形和一个圆（从PNG），使用libgdx。

I'm trying to draw a triangle and a circle (From a png) on the screen, using libgdx.

当我运行这个，我只能看到纹理（圈子）在屏幕上。我应该怎么做才能使双方网格和纹理可见的？

When I run this, I can only see the Texture (circle) on the screen. What should I do in order to make both Mesh and the Texture visible ?

推荐答案

SpriteBatch使用正交投影矩阵。当你调用batch.begin（），然后应用其矩阵（见SpriteBatch.setupMatrices（）。

SpriteBatch uses orthographic projection matrix. When you call batch.begin() then it applies its matrices (see SpriteBatch.setupMatrices().

因此​​，无论：

1. 改变顶点网格，所以它在屏幕上：

1. change vertices for mesh, so it is on screen:

mesh.setVertices(new float[] { 100f, 100f, 0, 
          400f, 100f, 0, 
          250, 400f, 0 });

动呈现网状的出批渲染：

move rendering of mesh out of batch rendering:

Gdx.gl10.glMatrixMode(GL10.GL_PROJECTION);
Gdx.gl10.glLoadIdentity();
Gdx.gl10.glMatrixMode(GL10.GL_MODELVIEW);
Gdx.gl10.glLoadIdentity();
mesh.render(GL10.GL_TRIANGLES, 0, 3);

batch.begin();
batch.draw(texture, 10, 10);
batch.end();

您必须重新分批设置在开始投影和变换矩阵（）;因为SpriteBatch.end（）不设置矩阵回来。

you have to reset the projection and transformation matrices set by batch in begin(); because SpriteBatch.end() doesn't set matrices back.

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