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;
			}
		}
	}