将顶点添加到libgdx网格 [英] Adding a Vertex to a libgdx Mesh

问题描述

基本上是标题.

您可以保留创建网格时所需的更多空间

You can reserve more than you need when creating a mesh

mesh = new Mesh(false, 100, 0, new VertexAttribute(Usage.Position, 3, "a_position"));

但是没有添加顶点的方法.您可以获取FloatBuffer并将其添加到其中，但是我得到了奇怪的结果.我还尝试了带有offset的mesh.setVertices，但这也不起作用.

But there is no method for adding a vertex. You can get the FloatBuffer and add to that, but I get strange results. I also tried the mesh.setVertices with offset but that does not work either.

我调试了绘图点.有效，直到我尝试以任何方式添加顶点(即使我调整偏移量以在一个顶点中考虑3个浮点)

I debugged with drawing points. Works until I try adding a vertex by any means (even if I tweak offsets to account for 3 floats in one vertex)

复制的代码段:

mesh.setVertices(new float[] {
                -0.5f, -0.5f, 0,
                0.5f, -0.5f, 0/*,
                -0.5f,0.5f,0.f*/});//works if I uncoment this
mesh.setVertices(new float[]{-0.5f,0.5f,0.f}, 6, 3);//but comment this out

我也尝试过

squareMesh.setVertices(new float[]{-0.5f,0.5f,0.f}, 2, 3);

谢谢:)

推荐答案

添加是一个坏主意，因为必须重新创建基础缓冲区，这会花费大量时间.取而代之的是，应该批量分配网格，并且仅渲染当前使用的网格.

Adding is a bad idea because the underlying buffers must be recreated and that takes up a lot of time. Instead, one should allocate meshes in bulk and only render what is currently used.

例如mesh.render(GL10.GL_TRIANGLES,0,num_triangles);

关于更新缓冲区:

FloatBuffer fbuftmp = mesh.getVerticesBuffer(); 
BufferUtils.copy(buf,fbuftmp,fbuftmp.capacity(),0);

buf是浮点数组.

出于说明原因使用BufferUtils.copy 此处

Use BufferUtils.copy for reason explained here

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