diff --git a/easymocap/visualize/render_func.py b/easymocap/visualize/render_func.py
new file mode 100644
index 0000000..ce4b3ab
--- /dev/null
+++ b/easymocap/visualize/render_func.py
@@ -0,0 +1,99 @@
+'''
+  @ Date: 2021-11-22 15:48:13
+  @ Author: Qing Shuai
+  @ LastEditors: Qing Shuai
+  @ LastEditTime: 2022-05-05 16:43:17
+  @ FilePath: /EasyMocapPublic/easymocap/visualize/render_func.py
+'''
+# 提供各个接口的统一的对外的接口，封装了一些利用基础接口实现的功能
+import cv2
+class RenderFunc:
+    def __init__(self, render) -> None:
+        self.render = render
+        self.position = {}
+    
+    def render_all(self, images, results, cameras, extra_mesh):
+        camnames = list(images.keys())
+        images = [images[cam] for cam in camnames]
+        cameras = [cameras[cam] for cam in camnames]
+        render_results = self.render.render_image(results, images, cameras, 
+            extra_mesh=extra_mesh)
+        render_results = {cam: [res[nv] for res in render_results] for nv, cam in enumerate(camnames)}
+        return render_results
+    
+    def render_image(self, images, results, cameras, extra_mesh):
+        render_results = self.render_all(images, results, cameras, extra_mesh)
+        results = {cam: val[2] for cam, val in render_results.items()}
+        return results
+    
+    def render_mask(self, images, results, cameras, extra_mesh):
+        render_results = self.render_all(images, results, cameras, extra_mesh)
+        results = {cam: val[0][..., 3] for cam, val in render_results.items()}
+        return results
+    
+    def render_depth(self, images, results, cameras, extra_mesh):
+        render_results = self.render_all(images, results, cameras, extra_mesh)
+        results = {cam: val[1] for cam, val in render_results.items()}
+        return results
+    
+    def render_color(self, images, results, cameras, extra_mesh):
+        render_results = self.render_all(images, results, cameras, extra_mesh)
+        results = {cam: val[0][..., :3] for cam, val in render_results.items()}
+        return results
+    
+    def render_corner(self, images, results, cameras, extra_mesh):
+        render_results = self.render_all(images, results, cameras, extra_mesh)
+        results = {}
+        for cam, (color, depth, image) in render_results.items():
+            mask = color[:, :, 3]
+            H, W = mask.shape[:2]
+            scale = 3
+            img_inp = cv2.resize(images[cam], (W//scale, H//scale))
+            if cam not in self.position.keys():
+                top_left = mask[:, :W//2]
+                top_right = mask[:, -W//2:]
+                if (top_left>0).sum() > (top_right>0).sum():
+                    position = 'topleft'
+                else:
+                    position = 'topright'
+                self.position[cam] = position
+            position = self.position[cam]
+            if position == 'topleft':
+                image[:img_inp.shape[0], -img_inp.shape[1]:, :3] = img_inp
+            elif position == 'topright':
+                image[:img_inp.shape[0], :img_inp.shape[1], :3] = img_inp
+            results[cam] = image
+        return results
+
+    def factory(self, mode):
+        if mode == 'image':
+            return self.render_image
+        elif mode == 'color':
+            return self.render_color
+        elif mode == 'depth':
+            return self.render_depth
+        elif mode == 'corner':
+            return self.render_corner
+        elif mode == 'mask':
+            return self.render_mask
+        elif mode == 'instance-mask':
+            return self.render_mask
+        elif mode.startswith('instance-depth'):
+            return self.render_depth        
+
+def get_ext(mode):
+    ext = {'image': '.jpg', 'color':'.jpg', 'blend': '.jpg',
+            'depth':'.png', 'mask':'.png', 'instance':'.png',
+            'instance-mask': '.png', 'instance-depth': '.png',  'instance-depth-twoside': '.png',
+            'side': '.jpg'
+            }.get(mode, '.jpg')
+    return ext
+
+def get_render_func(mode, backend='pyrender'):
+    if backend == 'pyrender':
+        from .pyrender_wrapper import Renderer
+        render = Renderer()
+    else:
+        raise NotImplementedError
+    renderer = RenderFunc(render)
+    return renderer.factory(mode)
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