Contents
Is a shadow accurate?
Light, Shadow and Reflection The shadow does not always give an accurate picture of the shape of the chair. The shape of the shadow changes its shape with respect to the placement of the object in the path of light. The position of the object plays a very important role in the formation of a shadow.
Where do you see the shadow of an object?
Light rays travel from a source in straight lines. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. This results in an area of darkness appearing behind the object. The dark area is called a shadow.
Is your shadow your true body shape?
As long as there is light, our shadows are always with us, extending from and moving with the bodies they resemble. Shadows are linked to the body, but unlike all other parts of the body, they are purely visual, changing with sources of illumination and lacking tactile or proprioceptive sensors.
Can a cascade be rendered as a shadow map?
Every cascade will be rendered into its own private shadow map. The shadow algorithm itself will remain the same but when sampling the depth from the shadow map we will need to select the appropriate map based on the distance from the viewer. Let’s take a look at a generic view frustum: As usual, we have a small near plane and a larger far plane.
Why are some pixels rendered into more than one shadow map?
As you can see, there is some overlap of the bounding boxes due to the orientationn of the light which means some pixels will be rendered into more than one shadow map. There is no problem with that as long as all the pixels of a single cascade are entirely inside a single shadow map.
How is the shadow map chosen in the shader?
The selection of the shadow map to use in the shader for shadow calculations will be based on the distance of the pixel from the actual viewer. Calculations of the bounding boxes that serve as the basis for the orthographic projection in the shadow phase is the most complicated part of the algorithm.
Why are my shadow maps not casting shadows?
Shadow map resolution can also be too high. Although a higher resolution is less noticeable, it nevertheless can result in small objects, such as telephone wires, not casting shadows. Also, having too high of a resolution can cause severe performance issues because of texture access patterns.