Hello

First sorry for my english.

For my project, i need to display shadow of objects on the ground (a plane), from a point light source. 
The objects can be very close to the light source, and i need to display the shadow on long distance.

In order to calcul shadow from a PointLight, i use HardShadowMapMethod.

My problem is:

Either i set light falloff with small value (or epsilon with high value) and a lot of parrallel lines are displayed on the ground (kind of artifact??)

Or i set light falloff with high value but there is a big shadow gap between the object and his shadow.

Is there a solution for this kind of situation?
is there other method than HardShadowMapMethod which support point light source?

I use Gold version.

playing with light radius, light falloff, epsilon and dephtmapsize, impossible to have shadow without gap AND without parrallel lines.

any idea?

help please

To get a sense of scale, in those cases, what are the values of:
- the casting object’s size (radius)
- the light fallOff value
- the epsilon

Cheers,
David

- the casting object’s size (radius) = 1
- the light fallOff value = 60 (the field’s size)
- the epsilon = 0.01 (less increase the gap, more increase the parrallel lines)

thanks

other points:
my pointlight is close to the field (field y 0, light y 1.6)
dephtmapsize is “limited” to 1024 (if i put no value:dephtmapsize=512 , if i put 2048: it display nothing)

Could you try changing the values by a factor of 30 or so - except for the epsilon, keep that small to see if it affects anything?

with a ratio of 30 between radius and falloff, the result look like my first screenshot. (gap reduced but lot off parralel lines) (radius:1 falloff:30)

with a ratio of 60 between radius and falloff, the result look like my last screenshot. (parralel lines reduced but big gap) (radius:1 falloff:60)

those 2 setup with same epsilon value : 0.01

thanks

I didn’t mean change the ratio, I meant multiplying all the values by 30 (radius: 30, falloff: 1800, etc)

Ok sorry. I already tested all the scene with a scale factor of 100 (and radius, falloff… x 100) but it’s exactly the same effects.

If i understand well the way to map shadow, It realy seems to be a problem between the bias, the depthmap size and distances light/ground.

In attached picture, i tried to represent my situation.

looks like there is not enough distance between 2 points on the ground when translated to the light’s point of view, am i right?

So is there a way to increase dephtmap size (for better “resolution”)

Maybe my explanations are not very clear but any ideas or advices would be very useful

Solved!

problem was due to my ground which cast is own shadow.

-castsShadows disabled on my ground meshe.
-epsilon still on very small value to avoid gap, cause the light is very close to the ground.

no parrallel lines anymore.

Thank you David!