US 11,682,159 B2
Systems and methods for soft shadowing in 3-D rendering casting multiple rays from ray origins
Justin P. DeCell, San Francisco, CA (US); and Luke T. Peterson, San Francisco, CA (US)
Assigned to Imagination Technologies Limited, Kings Langley (GB)
Filed by Imagination Technologies Limited, Kings Langley (GB)
Filed on Jun. 7, 2021, as Appl. No. 17/341,250.
Application 17/341,250 is a continuation of application No. 16/706,584, filed on Dec. 6, 2019, granted, now 11,030,795, issued on Jun. 8, 2021.
Application 16/706,584 is a continuation of application No. 16/030,510, filed on Jul. 9, 2018, granted, now 10,535,183, issued on Jan. 14, 2020.
Application 16/030,510 is a continuation of application No. 15/059,818, filed on Mar. 3, 2016, granted, now 10,049,489, issued on Aug. 14, 2018.
Claims priority of provisional application 62/127,439, filed on Mar. 3, 2015.
Prior Publication US 2021/0295590 A1, Sep. 23, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 15/06 (2011.01); G06T 17/00 (2006.01)
CPC G06T 15/06 (2013.01) [G06T 17/005 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A machine-implemented method of graphics processing, comprising:
determining, at a position in a scene, an extent of occlusion from a light by
determining a glancing ray which, of a plurality of rays cast from said position towards different points within the light, is the closest ray to an occlusion which is not occluded by the occlusion; and
using an angle between the determined glancing ray and a ray cast towards a predefined point on the light to determine the extent of occlusion at said position in the scene from the light.