No Shadows on Colour by Height Shader

Unity Engine
1

Hello,

to preface this, I’m rather new to Unity and have no experience with shaders so far.

So far I’ve got a game that basically generates a 100x100 world with random heights.

It looks like this:

1040×542 728 KB

As you can see, there are shadows under every tree.

Now I’ve got a shader by Jason Beetham that colors the ground based on height. Sadly this shader outputs only flat colors:

1043×558 488 KB

Now I wanted to “combine” my ground grass texture with this shader so it looks something like this:

1920×1040 667 KB

What I did was just fade the Standard shader with the grass texture on the Height Shader. But as you can see there are no shadows.

Is there a simple way to get shadows to work? Is there maybe another way of doing this?

Here’s the shader code:

Shader "Lit/Smooth Shaded Colour By Height"
{
    //Created By Jason Beetham
    Properties
    {
        _First("Highest Point",float) = 1
        _Second("Second Heighest",float) = 1
        _Third("Third Heighest",float) = 1
        _Fourth("Fourth Heighest",float) = 1
        _FirstC("Highest Point Colour", Color) = (0,0,0,1)
        _SecondC("Second Heighest Colour",Color) = (0,0,0,1)
        _ThirdC("Third Colour",Color) = (0,0,0,1)
        _FourthC("Fourth Colour",Color) = (0,0,0,1)
        _FifthC("Fifth Colour",Color) = (0,0,0,1)
    }
        SubShader
        {
        Lighting on
        Pass
            {
            Cull Back
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #include "UnityCG.cginc"
                #include "Lighting.cginc"
                #include "AutoLight.cginc"
                #pragma multi_compile_fwdbase nolightmap nodirlightmap nodynlightmap novertexlight
               struct appdata
            {
                float2 uv : TEXCOORD0;
                fixed4 diff : COLOR;
                float3 normal : NORMAL;
                float4 vertex : POSITION;
            }




;
            struct v2f
            {
                float2 uv : TEXCOORD0;
                fixed4 diff : COLOR;
                float3 normal : NORMAL;
                float4 vertex : POSITION;
            }




;
            float4 _FirstC;
            float4 _SecondC;
            float4 _ThirdC;
            float4 _FourthC;
            float4 _FifthC;
            float _Scale;
            float _First;
            float _Second;
            float _Third;
            float _Fourth;
            float _Fifth;
            float4 _Position;
            v2f vert(appdata v)
            {
                float4 tempPos = mul(unity_ObjectToWorld, float4(0,0,0,1));
                _Position = mul( unity_WorldToObject,tempPos);
                v2f OUT;
                OUT.normal = v.normal;
                OUT.vertex = UnityObjectToClipPos(v.vertex);
                if (v.vertex.y >= _First) {
                    OUT.diff = lerp(_FirstC,_SecondC,(_First /v.vertex.y) +.1f);
                }


                else if (v.vertex.y >= _Second && v.vertex.y < _First) {
                    OUT.diff = lerp(_ThirdC,_SecondC, (v.vertex.y / _First));

                }


                else if (v.vertex.y >= _Third && v.vertex.y < _Second) {
                   OUT.diff = lerp(_FourthC,_ThirdC, (v.vertex.y / _Second));
                }


                else if (v.vertex.y <= _Third && v.vertex.y > _Fourth){
                     OUT.diff = lerp(_ThirdC,_FourthC, (v.vertex.y / _Third));
                }

                else {
                    OUT.diff = _FifthC;
                }

                return OUT;
            }





                fixed4 frag(v2f i) : SV_Target
                {
                float4 col = i.diff;
                half3 lightColor = ShadeVertexLights(i.vertex, i.normal);
                col.rgb *= lightColor;
                return col;
            }

ENDCG
}
}
}

Any help is appreciated. Thanks!

2

Okay, maybe I need to ask a different question.

Is there a way to add the option for a texture to that shader code? Basically all I want is to use this shader on a grass texture. That way I wouldn’t have to use two materials and combine them by making the grass texture transparent or fade, which makes shadows disappear.

Or is there another way of doing this?

3

You might look at using a surface shader.

Otherwise start going through these: