Hello,
I was wondering if there was a way to link flowgraph and a material parameter.
Basically, what i'm trying to do is raytrace from the playercamera, and when it hit a flagged material, a parameter start to increase.
I was talking with themodman101 and apparently this functionnality seems broken... is there is a way to do that in 5.X ?

There is a node called Material:EntityMaterialParams or Material:MaterialParams that allows you to change specific settings of a material.
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If you want to change something else that this node doesn't allow you to change you will most likely need to create a whole new material and swap the material using the Material:SetObjectMaterial or the Material:EntityMaterialChange nodes.