Graphics.DrawMeshInstanced

Posted 2020-10-12 Hichy

Draw the same mesh multiple times using GPU instancing.

可以免去创建和管理gameObj的开销

并不是立即绘制,如需:Graphics.DrawMeshNow

每帧调用一次,当帧发送绘制请求

Meshes are not further culled by the view frustum or baked occluders, nor sorted for transparency or z efficiency.

You can only draw a maximum of 1023 instances at once

SE 3.0 以上支持

材质要勾上 enableInstancing  总的检查:material.enableInstancing && SystemInfo.supportsInstancing 

过程中遇到的问题:

导入mesh,的Use File Scale 勾上就不显示??? 模型的缩放调整有问题,去掉后原本的模型直接放显得特别大

感觉像是这个函数强行用了一次file scale,再用会变得更小(函数自身*导入参数)

去掉设置,这个函数的变正常,但直接拖到游戏就不对,应该是个bug

public class GpuInstancingTest : MonoBehaviour {
	public Mesh mesh;
	public Material material;
	
	List<Matrix4x4> matrices = new List<Matrix4x4>();

	void Start()
	{
		if (!material.enableInstancing || !SystemInfo.supportsInstancing)
		{
			enabled = false;
			return;
		}

		for (int i = 0; i < 10; ++i)
		{
			Matrix4x4 mt = Matrix4x4.TRS(transform.position + (i * 1.1f) * Vector3.up, transform.rotation, Vector3.one);
			matrices.Add(mt);
		}
	}

	// Update is called once per frame
	void Update () {
		Graphics.DrawMeshInstanced(mesh, 0, material, matrices);
	}
}

x

26

 

1

public class GpuInstancingTest : MonoBehaviour {

2

    public Mesh mesh;

3

    public Material material;

4

5

    List<Matrix4x4> matrices = new List<Matrix4x4>();

6

7

    void Start()

8

    {

9

        if (!material.enableInstancing || !SystemInfo.supportsInstancing)

10

        {

11

            enabled = false;

12

            return;

13

        }

14

15

        for (int i = 0; i < 10; ++i)

16

        {

17

            Matrix4x4 mt = Matrix4x4.TRS(transform.position + (i * 1.1f) * Vector3.up, transform.rotation, Vector3.one);

18

            matrices.Add(mt);

19

        }

20

    }

21

22

    // Update is called once per frame

23

    void Update () {

24

        Graphics.DrawMeshInstanced(mesh, 0, material, matrices);

25

    }

26

}