We propose an approach for the appearance synthesis of objects with matte surfaces made of arbitrary fluorescent materials, accounting for mutual illumination. We solve the problem of rendering realistic scene appearances of objects placed close to each other under different conditions of uniform illumination, viewing direction, and shape, relying on standard physically based rendering and knowledge of the three-dimensional shape and bispectral data of scene objects. The appearance synthesis model suggests that the overall appearance is decomposed into five components, each of which is expanded into a multiplication of spectral functions and shading terms. We show that only two shading terms are required, related to (a) diffuse reflection by direct illumination and (b) interreflection between two matte surfaces. The Mitsuba renderer is used to estimate the reflection components based on the underlying Monte Carlo simulation. The spectral computation of the fluorescent component is performed over a broad wavelength range, including ultraviolet and visible wavelengths. We also address a method for compensating for the difference between the simulated and real images. Experiments were performed to demonstrate the effectiveness of the proposed appearance synthesis approach. The accuracy of the proposed approach was experimentally confirmed using objects with different shapes and fluorescence in the presence of complex mutual illumination effects.

中文翻译：

---

具有互照效应的荧光物体的外观合成

我们提出了一种方法，用于合成具有由任意荧光材料制成的哑光表面的物体，并考虑相互照明。我们依靠标准的基于物理的渲染和场景对象的三维形状和双光谱数据的知识，解决了在不同的光照、观察方向和形状的条件下渲染彼此靠近的对象的真实场景外观的问题。外观合成模型建议将整体外观分解为五个分量，每个分量都扩展为光谱函数和阴影项的乘积。我们表明，只需要两个着色项，与 (a) 直接照明的漫反射和 (b) 两个哑光表面之间的相互反射有关。Mitsuba 渲染器用于根据基础蒙特卡罗模拟来估计反射分量。荧光成分的光谱计算在很宽的波长范围内进行，包括紫外线和可见光波长。我们还提出了一种补偿模拟图像和真实图像之间差异的方法。进行了实验以证明所提出的外观合成方法的有效性。在存在复杂的互照明效应的情况下，使用具有不同形状和荧光的物体，通过实验证实了所提出方法的准确性。包括紫外线和可见光波长。我们还提出了一种补偿模拟图像和真实图像之间差异的方法。进行了实验以证明所提出的外观合成方法的有效性。在存在复杂的互照明效应的情况下，使用具有不同形状和荧光的物体，通过实验证实了所提出方法的准确性。包括紫外线和可见光波长。我们还提出了一种补偿模拟图像和真实图像之间差异的方法。进行了实验以证明所提出的外观合成方法的有效性。在存在复杂的互照明效应的情况下，使用具有不同形状和荧光的物体，通过实验证实了所提出方法的准确性。