Shadow Play

I really want to play with shadows, and since emitted light is projected in a sphere, we are going to need to use Uber's Spherify/Unspherify snippet .

Here's a snapshot of what I've been working with.



and the snippet.

Shadows.ffxml

Shadows are the absence of the color of the light casting them, so if a red light is casting a shadow, and no other lights are around, the shadows are black.

Shadows from the sun have a blueish hue, this is from the ambient light of the atmosphere, as well as absence of the yellow tint the sun is.

Remember, the farther the object is from the light source, the longer the shadow. If the motion blur component had a green input for radius, this would be solved by adding a gradient where the top color is black and the bottom color is lighter (here is where "shadow length", or the more 3d "light height", slider would come in).

Even if it doesn't, you can still use the gradient (first color = 50% gray, second color lighter with the slider) for the offset v on the offset right next to it. The problem is that this makes a shadow in front of the object (towards the light) as well as behind, so you would somehow need to get rid of those shadows in front.

Or, the Filter Forge team can make a unidirectional motion blur *nudge nudge*

I guess I can try Crapadilla's wind blur, slow as it is...

Well, it's not like I forgot, it's just very hard to implement into FF. Besides, the poles nearest to the light source need to be bigger, for they block more light.

I think it would be relatively easy to implement, once you get the formula down, the center is no different than any other place.