与Libgdx高效的3D块渲染 [英] Efficient 3D block rendering with Libgdx

问题描述

首先，我是pretty的新的3D节目和libgdx。 我看了一些教程，我已经使我想要的场景。我有一些1X1X1块，用 ModelBuilder.createRect（）创建的每一个可见的脸，因此，如果另一个块覆盖面这一块，有没有对这个块创建矩形。另外，顶部和底部的矩形是不需要的，因为我永远无法看到它们（除楼）。所以我想，这是pretty的效率。我也有背面剔除启用，我 Viewfrustum扑杀。不过，如果我看的方向，那里有很多块是我viewfrustum的FPS下降到15-20。这仍然是好适合我，因为我的笔记本电脑是超过5岁，它的性能是不是最好的，但这个答案让我想想。

To start with,I am pretty new to 3D programming and libgdx. I looked at a few tutorials and I already render the scene I want. I have some 1x1x1 blocks, created with ModelBuilder.createRect() for every visible face, so if another block covers a face of this block, there is no rect created for this block. Also the top and bottom rect is not needed, as I can never see them (except for the floor). So I thought, that this is pretty efficient. I also have Backface culling enabled and I do Viewfrustum culling. However, if I look in a direction, where many blocks are in my viewfrustum the FPS go down to 15-20. This is still okay for me, as my laptop is over 5 years old and its performance is not the best, but this answer made me think.

模型构建器仅用于调试。好吧，但是我应该如何再建立我的盒子？为什么要创建一个型号在建模的应用程序（如搅拌机），简单的方块？通过这样做，我甚至不能宰杀的脸，这是由其他模块占用。 所以我的问题是： 如何创建和渲染这些箱子的最有效方法是什么？

"ModelBuilder is used for debug only". Okay, but how should i then create my boxes? Why should i create a Model in a Modeling app (like Blender), for simple squares? By doing this i couldn't even cull the faces, which are occupied by other blocks. So my question is: How can i create and render those boxes the most efficient way?

推荐答案

模型构建器＃createRect将为每个矩形的新模式。当渲染模型实例（的一部分），它意味着一个绘制调用。为此模型构建器＃createRect是非常低效的。最好是多个矩形组合成模型的单一（一部分）。这可以使用来完成：

ModelBuilder#createRect will create a new model for each rectangle. When rendering a (part of a) model instance, it implies a draw call. Therefor ModelBuilder#createRect is extremely inefficient. It is better to combine multiple rectangle into a single (part of a) Model. This can be done using:

modelBuilder.begin();
MeshPartBuilder mpb = modelBuilder.part(....);
mpb.rect(...); // first rect.
mpb.rect(...); // second rect.
// etc.
Model model = modelBuilder.end();

请注意，这还没有足够有效的对如体素引擎。如果你的目标是优化体素，你可能会想建立网格的自定义RenderableProvider（域剔除和深度排序后）。这里有一个例子：<一href="https://github.com/libgdx/libgdx/tree/master/tests/gdx-tests/src/com/badlogic/gdx/tests/g3d/voxel" rel="nofollow">https://github.com/libgdx/libgdx/tree/master/tests/gdx-tests/src/com/badlogic/gdx/tests/g3d/voxel

Note that this is still not efficient enough for e.g. a voxel engine. If you are aiming to optimize for voxels, you'll probably want to build the mesh (after frustum culling and depth sorting) in a custom RenderableProvider. Here's an example: https://github.com/libgdx/libgdx/tree/master/tests/gdx-tests/src/com/badlogic/gdx/tests/g3d/voxel

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