unity shit

 There're two parts to this - lets focus on the first Pass block -  The first block allows the shader to receive shadows. The previous ones were all flat. The LightMode tag sets it to Forward lighting, which changes it from the default Deferred lighting that Unity uses.  We have some extra #pragma stuff that I don't really understand - apparently it's there so we can have complete control over the lighting? Some extra #includes are present as well...more functions to do with lighting. In our appdata struct we're using the NORMAL now. In the v2f we call the "position"  variable "pos", because later on a TRANSFER_SHADOW function requires that specific name within the struct. It won't recognise "vertex". There's also a SHADOW_COORDS variable, to tell the shadow where to go. In our vert function we convert the vertex to screenspace, calculate its worldspace normal, then get the dot product between the normal & the light's positi...

Don't think I want to cover writing actual custom lighting models just yet. However, here is how you might implement the Lambert lighting model within your shader. Blinn is done below, with a brief explanation. Essentially they are like mini functions. They must begin with the word "Lighting" and match the name of the lighting model that you specify in the #pragma surface surf ______ Lambert works by taking the dot product of the surface normal and light direction vectors. Where the light is aligned to the surface normal, the surface will seem brighter. As it gets closer to 90degrees/perpendicular the surface will be darker. This value NdotL is multiplied by the surface colour (albedo) ,the colour of any lights (_LightColor0, a built in variable) and the attenuation, which is how intense the light is.  Shader "Dave/customLightingmodel" {     Properties{         _Color("Color",color) = (1,1,1,1)     }     Sub...