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Multi pass rendering and order of things

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I have been reading here and there about multi pass rendering.
And I was wondering in what order shall different passes be done?

But then I figured all passes are added together so does the order matter?

Then I thought sometimes they multiply with previous pass then order must be important right?


Can I read somewhere about what to do and in what order to do it?

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No one knows in what order to do things in a multi pass forward renderer?
Are they obsolete ? what should I use instead? deferred?

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Your asking a question about a technique that you don't understand. Ask yourself first, why do you need a multi-pass and are you strictly talking about blending?



But then I figured all passes are added together so does the order matter?[/quote]
Order of what...again are you talking about blending?

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Yeah I am asking because I do not understand.
I am not sure I need it even..

Im thinking about a scene with objects with multiple effects added.
Several different shaders and so on applied to the same object.

Your asking a question about a technique that you don't understand. Ask yourself first, why do you need a multi-pass and are you strictly talking about blending?



But then I figured all passes are added together so does the order matter?

Order of what...again are you talking about blending?
[/quote]

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Well multiple effects can be added to a shader. If you want normal mapped, shadow mapped, parallax mapped, displacement mapped, bone animated objects, then you do that all in one shader, you dont draw it 8 times and apply effects over those pixels. If one object only has normal mapping, then make a simple normal mapping shader.

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