behind effect

hi,

I want to implement in future a behind-effect shader, a usual thing in RTS games displaying units behind trees/buildings/obstacles as a coloured outline or a filled shape like this:



any idea how does it work?
I want to avoid using a new view, maybe a 2nd pass is enough?

thanks.

Set ZNEAR or add the corresponding render states for ZFunc and so on..

ööö... now I'm not sure exactly how but at least a good starting point

znear is a flag. You just have to use set();

I know that. but don't know how to utilize it to display the covered parts of an animated model with a colour, when it is partially covered by another model.

I'd go for some custom pixel shader with depth testing...

Maybe there's some other, clever way using ZFunc and rendering the model several times.

EDIT: yeah, writing the model with a first pass (blue-see-through-wall-colored, no depthtesting, no alphawrite) and then rendering the model in a second pass as usual (with depthtesting and alphawrite)

maybe it's even easier, I don't know what kind of stuff zFunc supports since I never use it...

i think kartoffels idea is the right way i don't think it will work in one pass

maybe it can be done a little bit more efficient (although still with two passes)
I'll give it a try but not today anymore

thanks, what I really needed was the concept. 2 passes migth be okay, probably I'll use it only for the 1st 1-2 lods to lower performance cost caused by the high unit model quantity.

by ZEnable I can do this (ZFunc does not really help and ZNEAR also seems to be not useful):



unfortunately unit-to-unit coverage has a bad look I can't resolve currently...

i think the stencil buffer could help here but i have no idea how it works....

I use shadow_stencil -1, so it is disabled in theory... I try to take a look in the source of 0.A.D., but it is opengl...