Projected Shadows Maps

backFaceRemoval

• Tries to fix the defect of the back face projection.

casterRangeLimit

• Limits the shadow in the surroundings of the caster position.

• By default, this value is zero.

• However, it can be activated, for example, to prevent a small man placed on a scaffolding cast a shadow both on the scaffolding and on the floor ten meters below; in this case it is sufficient to set this value to the maximum distance that may have a shaded pixel with respect to the position of the man.

• This option also blurs the shadow based on the pixel distance from the caster's position.

• In practice, it is as if the shadow went only on the pixels included in a sphere of ray casterRangeLimit positioned from the caster position.

• If there are more caster at the same shadow texture at the same time, the position of the first found is used.

poisson_blur

• When activated, this structure produces a soft shadow.

• The scale parameter is used to scale the soft part of the shadows.

textureExpirationTime

• Serves to release the textures of shadows that have not been used for n seconds.

• This can be useful if in some frames there are peaks of shadows while in the subsequent ones there are no more peaks; releasing them avoids keeping memory allocated for nothing.

• On the other hand, it is not advisable to allocate and deallocate memory often, so this parameter must be well calibrated.

• Putting 0 the shadow textures are never deallocated.

textureRefreshMultiplier

• Used to scale the refresh time of the shadow textures.

• This value changes the refresh value of each light, so it is possible to speed up or slow it down globally based on PC performance.

• For example, if the lights are set to 20 frames per second but we see that it is too much, putting this value at 0.5 we would have a refresh of 10 frames per second.