Blender.org

I have blender 2.66 im using cycles render I have a nice scebe with a car model and would like to drop paintballs on my car so I created that,but my problem is making a shot clip wit cycles render ,everytime I move the screen it rerender the scene over again,so how do create my clip in cycles render?

Tryd that doesnt work,how do I post a picture of the problem im having?

thats dosent seem to work,im not to sure how to revert normals,how do i post a pic of my model ?this problem has had me at a stand still for a while i even started a new model and it still appers

I know how to add two meshs together but iv made a car,i made front ,back,roof and doors but when I add them together the is a seem,a black line showing where thy have bein connected,how do I get this black line to dissapare?it only shows up when I SMOOTH the surface,can anyone help?[/quote]