For people facing a similar problem there is a nice solution by BetaRavener, check out the link https://github.com/helix-toolkit/helix-toolkit/issues/311

Hello Suran,

I believe you need the sharpDX extension for casting shadows.

Check out the ShadowMapDemo in https://github.com/helix-toolkit/helix-toolkit/tree/master/Source/Examples/WPF.SharpDX to see how you could do it.

But there may be other methods, I'm quite new to the helixtoolkit and not a computer scientist

Good luck :)