基于纹理空间与屏幕空间混合的心脏次表面绘制方案

Cardiac Subsurface Rendering Scheme Based on the Blending of Texture Space and Screen Space

提出一种基于纹理空间和屏幕空间混合的心脏次表面绘制方案,用于解决虚拟手术系统中心脏次表面散射材质绘制难度大、仿真效果准确性不足的问题。以往的研究方案中,都只是基于单一的空间进行次表面绘制,难以适应虚拟手术真实感的要求。针对心脏光照计算中的次表面散射材质绘制方法的改进,新方案将纹理坐标作为渲染对象坐标进行卷积运算,使2D纹理能够产生基础的次表面散射效果。同时,结合基于屏幕空间的算法弥补纹理空间算法的不足进行混合绘制,并使用SMAA和抖动策略作为后处理步骤来提高子像素形态抗锯齿,产生比先前方案更好的整体效果。实验结果表明,该方案在一定程度上降低了心脏次表面散射材质绘制难度的同时,提高了绘制的准确性和真实感。

In this paper,a cardiac blended rendering scheme of subsurface scattering material based on texture space and screen space was proposed. We applied it to solve the problem of cardiac subsurface scattering rendering complexity and poor rendering effects in the virtual surgery system. Previous research schemes for subsurface rendering were based on a single space,which was difficult to adapt to the requirements of virtual surgery realism.In order to improve the subsurface scattering rendering method in cardiac light calculation,our new scheme used the texture coordinates as the rendering object coordinates for convolution operations,so that the 2 D texture could produce the underlying sub-surface scattering effect. At the same time,our blended rendering scheme combined with the algorithm based on the screen space to compensate for the defects of the algorithm based on texture space and used SMAA and the jitter strategyas post-processing steps to enhance sub-pixel morphological antialiasing,resulting in a better overall effect. The experimental results show that our scheme can reduce the rendering complexity,improve the accuracy and rendering realism of subsurface scattering material to a certain extent as well.