一些新東西學習 - Texture3D,Texture2DArray

Texture3D

2021/2/28補充：

因為Unity RenderTexture3D轉Texture3D并不是很友善，寫了一個小工具：

https://files.cnblogs.com/files/hont/Texture3DRtToTexture3D.zip

Texture3D需要先在腳本中建立3D材質，然後賦予shader。

需要DX11支援，和材質采樣一樣，3D次元上可以被repleat和插值

參考文章:http://blog.csdn.net/wolf96/article/details/46239557

腳本:

using UnityEngine;

public class Texture3DTest : MonoBehaviour
{
    public Renderer target;
    public int size = 16;


    void Start()
    {
        var tex = new Texture3D(size, size, size, TextureFormat.RGBA32, false);
        var colors = new Color[size * size * size];
        var k = 0;

        for (int z = 0; z < size; z++)
        {
            for (int y = 0; y < size; y++)
            {
                for (int x = 0; x < size; x++, k++)
                {
                    if (z == 0)
                        colors[k] = Color.blue;
                    else
                        colors[k] = Color.red;
                }
            }
        }
        tex.wrapMode = TextureWrapMode.Repeat;
        tex.SetPixels(colors);
        tex.Apply();
        target.material.SetTexture("_MainTexture", tex);
    }
}      

shader:

Shader "Test/Texture3D"
{
    Properties
    {
        _MainTexture("Texture", 3D) = "" {}
        _Z("Z",float)=0
    }

    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert  
            #pragma fragment frag  

            #include "UnityCG.cginc"  

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            v2f vert(appdata_tan v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.texcoord;
                return o;
            }

            sampler3D _MainTexture;
            float _Z;

            float4 frag(v2f i) : COLOR
            {
                return tex3D(_MainTexture, fixed3(i.uv.x, i.uv.y, _Z));
            }

            ENDCG
        }
    }
}      

shader中類型聲明為'3D'

這裡隻繪制了藍色和紅色兩種顔色，最後會被插值：

Texture2DArray

最早在Adam的demo裡，地形中用到了這個東西。需要DX10支援

顧名思義，這個可以存放Texture2D的數組

參考:

https://docs.unity3d.com/Manual/SL-TextureArrays.html

https://github.com/keijiro/Texture2DArrayTest

using UnityEngine;

public class Texture2DArrayTest : MonoBehaviour
{
    public Material material;
    Texture2DArray mTexture;


    void Start()
    {
        mTexture = new Texture2DArray(256, 256, 2, TextureFormat.RGBA32, false, true);

        var temp = new Texture2D(256, 256, TextureFormat.RGBA32, false);
        for (int x = 0; x < temp.width; x++)
            for (int y = 0; y < temp.height; y++)
                temp.SetPixel(x, y, Color.red);

        mTexture.SetPixels(temp.GetPixels(), 0);

        for (int x = 0; x < temp.width; x++)
            for (int y = 0; y < temp.height; y++)
                temp.SetPixel(x, y, Color.blue);

        mTexture.SetPixels(temp.GetPixels(), 1);

        mTexture.Apply();

        material.SetTexture("_TextureArray", mTexture);
    }
}      

Shader:

Shader "Unlit/NewUnlitShader"
{
    Properties
    {
        _TextureArray("TexArray", 2DArray) = "" {}
        _Index("Index",float)=0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog
            #pragma target 3.5
            
            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float _Index;
            
            UNITY_DECLARE_TEX2DARRAY(_TextureArray);

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 r = UNITY_SAMPLE_TEX2DARRAY(_TextureArray, float3(i.uv.x, i.uv.y, _Index));
                return r;
            }
            ENDCG
        }
    }
}      

 shader中類型聲明為2DArray

這裡也是放了紅藍兩種顔色的圖檔，分别放在兩個索引當中

最終效果：