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...

This is more or less the same as the last wall of code. However this time, we are using the Graphics draw to draw a quad, which consists of Four points, Two triangles. We need to adjust our buffer and create a new struct for this, as well as initialise our arrays in a specific way to ensure the quads are facing the correct direction.   As mentioned, our new Struct - Vertex stores a position, UV value and life. We're going to use the Compute Shader to calculate the postion of each particle-  but then draw a quad at that position. We set the specific values for the vertices in the compute shader too. (the UVs don't change for each quad, so we set that value in the C# script)     //Triangle 1 - bot left, top left, top right     vertexBuffer[index].position.x = p.position.x - halfSize;     vertexBuffer[index].position.y = p.position.y - halfSize;     vertexBuffer[index].position.z = p.position.z;     vertex...