Irrlicht Engine

I've taken a spot light PS and modified it a bit as you can see in the screen shot.

How can I prevent the light going through the wall so it wont lit any further the ground and the wall behind?

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the tutorial shows example of collision between two nodes.
from what I understand and read in the forum there's no way to be notified when collision ocurred (for example a car driving in arena needs collision response).

I tried looking inside SceneCollisionManager::getCollisionResultPosition but ...

To put the camera exactly behind your car take the direction of your car and multiply it by a factor -10 for example :

camera->setPosition(autoPosition -10 * vDir)

Is it the shader in CD3D9NormalMapRenderer.cpp?
its low level, too much for me, I have a book about HLSL..

Just wondering, how this effect created in games before pixel shader was available?

I dont understand how to do this.
I changed the material type and then needed to create tangents
for the room as in example 11 but the light still no good lighting the vertex.

Then I tried differently working inside example 11:
I removed all the lights and added the spot light but seen nothing ...

Im trying to create spot lights to simulate car headlights.
I added spot light using DX but the lighting doesn't look good.
I attached a Screen shot - the light pos is at the center of the car.

for testing I use the arena from one of the samples which has big polygons. if the lighting goes through ...