Question

unity 3d怎样在相机中导出rendertexture

Answer 1

由于项目需求，需要在Unity中播放高清视频，视频分辨率达到了3840x1200。采用的是C++ plugin解码视频，提供图片纹理给Unity渲染的方式。而在Unity中使用的是RenderTexture来保存解码的视频图片。为了方面调试，需要保存某一些时刻的图片数据到本地，可以采用下面的函数实现：

[csharp] view plain copy
[ContextMenu("Save png")]
private void SaveTextureToFile()
{
if (OutputTexture != null)
{
RenderTexture prev = RenderTexture.active;
RenderTexture.active = target;

Texture2D png = new Texture2D(OutputTexture.width, OutputTexture.height, TextureFormat.ARGB32, false);
png.ReadPixels(new Rect(0, 0, OutputTexture.width, OutputTexture.height), 0, 0);
byte[] bytes = png.EncodeToPNG();
string path = string.Format("Dump/raw {0}.png", Random.Range(0, 65536).ToString("X"));
FileStream file = File.Open(path, FileMode.Create);

BinaryWriter writer = new BinaryWriter(file);
writer.Write(bytes);
file.Close();

Texture2D.Destroy(png);
png = null;

RenderTexture.active = prev;
}

}