update README.md

README.md

@@ -14,7 +14,7 @@ Implicit surface rendering via ray tracing
 
 ## Project
 
-+ ```implicit_surface_ray_tracing```：主项目，输出带GUI的隐式曲面实时渲染程序
++ ```implicit_surface_ray_tracing```：主项目，输出带GUI的隐式曲面实时渲染程序，支持输出渲染结果为HDR、PNG、BMP格式
 + ```Sphere_Tracing_CPU_Test```：在CPU上对```Sphere Tracing```的测试和同```Adaptive Marching Points```的对比（因为调试```Compute Shader```过于困难）
 
 ## Build
@@ -29,9 +29,20 @@ Implicit surface rendering via ray tracing
 
 > 实际上用```glslc```对Shader做了控制，只有在```Debug```构建时才会测试步进步数
 
+在```1024*1024```分辨率、同屏渲染```200*200*50```个周期的TPMS时：
+| | Adaptive Marching Points | Sphere Tracing |
+| :---: | :---: | :---: |
+| frame time (ms) | 12+ | 0.6 ~ 0.7 |
+| fraps per second | 80+ | around 1400 |
+| rendering time per pixel (ns) | <= 11.5 | around 0.48 |
+| ray steps per pixel (approx.) | 8 ~ 10 | 1.5 ~ 2.5 | 
+| ray steps range (approx.) | 10 ~ 400 | 0 ~ 240 |
+
+> 目前来说，即便是使用```Sphere Tracing```也只能在保持微小结构可辩别的10倍基础分辨率（```10240*10240```）下达到30fps左右，建议实时渲染时以基础分辨率预览即可，需要输出高分辨率图像时再调高分辨率输出
+
 ## Screenshot
 
-![](./screenshot/capture.png)
+![](screenshot/capture.PNG)
 
 ## Known issues