论文标题
使用学习的转移对任意表面几何形状的实时渲染
Real-Time Rendering of Arbitrary Surface Geometries using Learnt Transfer
论文作者
论文摘要
预计的辐射转移(PRT)被广泛用于实时逼真的效应。 PRT将渲染方程式分解为传输和照明,从而使它们的先例能够。转移计算现场点的余弦加权可见性,同时照明从环境中发出光芒。先前的艺术以列表的方式存储了预先计算的转移,无论是顶点还是纹理空间。这些值在每个点以插值来获取以进行阴影。顶点空间方法需要密集的镶嵌网状顶点才能进行高质量的图像。纹理空间方法需要可用的非重叠和区域保护紫外线映射。他们还需要高分辨率的纹理以避免渲染文物。在本文中,我们提出了一个紧凑的传输表示,该表示直接在场景几何点上学习。具体而言,我们训练一个小的多层感知器(MLP)以预测采样表面点的转移。我们的方法是最有益的,而固有的网格存储结构和天然紫外线映射则是可用的,例如直接在表面上学习传输值的隐式表面。我们使用我们的方法证明了使用PRT对SDF几何形状上的弥漫性和光泽材料的实时,逼真的渲染。
Precomputed Radiance Transfer (PRT) is widely used for real-time photorealistic effects. PRT disentangles the rendering equation into transfer and lighting, enabling their precomputation. Transfer accounts for the cosine-weighted visibility of points in the scene while lighting for emitted radiance from the environment. Prior art stored precomputed transfer in a tabulated manner, either in vertex or texture space. These values are fetched with interpolation at each point for shading. Vertex space methods require densely tessellated mesh vertices for high quality images. Texture space methods require non-overlapping and area-preserving UV mapping to be available. They also require a high-resolution texture to avoid rendering artifacts. In this paper, we propose a compact transfer representation that is learnt directly on scene geometry points. Specifically, we train a small multi-layer perceptron (MLP) to predict the transfer at sampled surface points. Our approach is most beneficial where inherent mesh storage structure and natural UV mapping are not available, such as Implicit Surfaces as it learns the transfer values directly on the surface. We demonstrate real-time, photorealistic renderings of diffuse and glossy materials on SDF geometries with PRT using our approach.