Soft shadow rendering algorithm based on light characteristics of rectangle regions

Aiming at the difficulty that light soft shadow rendering in rectangular areas cannot meet the physical accuracy in real-time rendering, an approximate rectangular area light model rendering algorithm is proposed. The algorithm first generates shadow maps to record depth information from the perspective of the light source to render the scene, and then proposes a model that considers the relationship between the spatial position of the occlusion object and the shape of the light in the rectangular area. Calculate the width of the light in each direction of the rectangular area, the average depth around the texel, and the distance from the occluded object to the receiving object. Determine the spatial filter width of the shadow map corresponding to the visual field attractions, and finally use this width to obtain high-realism soft shadows in the shadow map. Experimental results show that this method is more effective than related algorithms.