立体渲染（英语：Volume rendering），又称为体绘制，是一种用于显示离散三维采样数据集的二维投影的技术。

一个典型的三维数据集是CT或者MRI采集的一组二维切面图像。通常这些数据是按照一定规则如每毫米一个切面，并且通常有一定数目的图像像素。这是一个常见的立体晶格的例子，每个体素用当前体素附近区域的采样值表示。

为了渲染三维数据集的二维投影，首先需要定义相机相对于几何体的空间位置。另外，需要定义每个点即体素的不透明性以及颜色，这通常使用RGBA（red, green, blue, alpha）传递函数定义每个体素可能值对应的RGBA值。

In scientific visualization and computer graphics, volume rendering is a set of techniques used to display a 2D projection of a 3D discretely sampled data set, typically a 3D scalar field.

A typical 3D data set is a group of 2D slice images acquired by a CT, MRI, or MicroCT scanner. Usually these are acquired in a regular pattern (e.g., one slice every millimeter) and usually have a regular number of image pixels in a regular pattern. This is an example of a regular volumetric grid, with each volume element, or voxel represented by a single value that is obtained by sampling the immediate area surrounding the voxel.