The irradiance map requires additional memory. If low settings are used, flickering may occur when rendering animations. Some details in indirect lighting can be lost or blurred due to the interpolation. The irradiance map can also be used to accelerate direct diffuse lighting from area light sources. The irradiance map can be saved and re-used to speed up calculations of different views for the same scene and of fly-through animations. The noise inherent to direct computation is greatly reduced. The irradiance map is very fast compared to direct computation, especially for scenes with large flat areas. The basic idea is to compute the indirect illumination only at some points in the scene and interpolate for the rest of the points. Irradiance map – Based on irradiance caching. Tends to produce noise in the images, which can be avoided only by shooting a larger number of rays, thus slowing it even more. Indirect illumination in the case of motion-blurred moving objects is computed correctly.
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Free from defects like flickering in animations. small and sharp shadows) in the indirect lighting. V-Ray implements several approaches for computing indirect illumination with different trade-offs between quality and speed:īrute force – The simplest approach indirect illumination is computed independently for each shaded surface point by tracing a number of rays in different directions on the hemisphere above that point.
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