How to set lights for 3d models?, problem is , i set point light in cameraposition, when ever i revolve the camera object doesn't look good it becomes more artificial(like darker in one side and brighter in another side),and when i use directional lighting its so brighter objects becomes white how to reduce the intensity of the directional light..?and how do i do some good real 3d lighting ..!! suggest me some tutorials or send me some links for that...!

If you use pixel shader you can reduce the light intensity using a factor value who is mul at the end of lighting equation :

LightIntensity * LightColor * (NdotL + SpecFactor)

About the dark zone, the result depends on your attenuation factor, the equation now become :

LightIntensity * LightColor * (NdotL + SpecFactor) * Attenuation

You can use smooth-step interpolation using Begin and End params to have easy setup.

If you have a light who is near of a plane surface, the light will not bounce like the real world.

To achieve that you have to write a Global Illumination real time or generated, using generated, you will have to not move the light.

If you are new in the world of lighting equation, I suggest you to not try to achieve Global Illumination (GI) before you understand lighting.

@ Ashaman73 Hawkblood Alundra

Thanks for your valuable comments guys,, kindly look at this

http://www.gamedev.net/topic/656328-does-anyone-implemented-the-gouraud-shading-algorithm-in-c-directx/