Unityのテクスチャ

Unity】Texture を Texture2D に変換する拡張メソッド

using UnityEngine;

public static class TextureExt
{
    public static Texture2D ToTexture2D( this Texture self )
    {
        var sw = self.width;
        var sh = self.height;
        var format = TextureFormat.RGBA32;
        var result = new Texture2D( sw, sh, format, false );
        var currentRT = RenderTexture.active;
        var rt = new RenderTexture( sw, sh, 32 );
        Graphics.Blit( self, rt );
        RenderTexture.active = rt;
        var source = new Rect( 0, 0, rt.width, rt.height );
        result.ReadPixels( source, 0, 0 );
        result.Apply();
        RenderTexture.active = currentRT;
        return result;
    }
}

Unityのテスクチャコピー(deep)

    {
        //参照だとダメ
        //      m_materials[name_list_curr].mainTexture = m_updatetex2d;

        //ConvertTextureはダメ: 何も表示されない
        //Graphics.ConvertTexture(m_updatetex2d, m_materials[name_list_curr].mainTexture);

        // CopyTextureはdeepcopy:何も表示されない
        //Graphics.CopyTexture(m_updatetex2d, m_materials[name_list_curr].mainTexture);

        //SetPixelsによるdeepcopy
        if (true)
        {
            var originalTexture = m_updatetex2d;
            Texture2D copyTexture = new Texture2D(originalTexture.width, originalTexture.height, TextureFormat.ARGB32, false);
            copyTexture.SetPixels32(originalTexture.GetPixels32());
            copyTexture.Apply();
            m_materials[name_list_curr].mainTexture = copyTexture;
        }

        // 外部テクスチャはコピーできない？
        if (false)
        {
            int texid = getTextureID4Unity();
            if (texid != -1)
            {
                IntPtr texidptr = new IntPtr(texid);
                Texture2D nativeTexture = Texture2D.CreateExternalTexture(
                    tex_sizeX, tex_sizeY,
                    TextureFormat.ARGB32,
                    false, false,
                    texidptr
                );

                IntPtr nativeData = nativeTexture.GetNativeTexturePtr();
                m_tex2d_2.UpdateExternalTexture(nativeData);

                {
                    var originalTexture = m_tex2d_2;
                    Texture2D copyTexture = new Texture2D(originalTexture.width, originalTexture.height, TextureFormat.ARGB32, false);
                    copyTexture.SetPixels32(originalTexture.GetPixels32());
                    copyTexture.Apply();
                    m_materials[name_list_curr].mainTexture = copyTexture;
                }

                //m_materials[name_list_curr].mainTexture = m_tex2d_2;
            }
        }
    }