koobas.hobune.stream
Color of vertex based on player distance
Hello, I am trying to figure out how to program a shader to change colors based on the player's position, similar to the picture I've attached.
What I am envisioning is the player moves around the game, and the GameObjects that have this shader will change colors based on how far away the player is from it. For this custom shader, each vertex would calculate the distance from the player, and then set the vertex to a specified color. Once all of the vertices have a color, it would rasterize the polygons. I am currently going over catlike coding tutorials to try and get an idea (http://catlikecoding.com/unity/tutorials/rendering/part-2/), but so far no success. Any reference material, advice, or examples would be much appreciated!
FIgure out how to do it with a friends help. It is a nieve way of doing it, but it works for the time being.
Shader "Unlit/Distance"
{
Properties
{
_MainTex ("Base (RGB)", 2D) = "white" {}
_FirstColor ("Color in First", Color) = (1, 0, 0, 1)
_SecondColor("Color in Second", Color) = (1, 1, 0, 1)
_ThirdColor ("Color in Third", Color) = (0, 1, 0, 1)
_FourthColor ("Color in Fourth", Color) = (0, 1, 1, 1)
_FifthColor("Color in Fifth", Color) = (0, 0, 1, 1)
_SixthColor ("Color in Sixth", Color) = (1, 0, 1, 1)
_FirstDistance ("First Distance", Float) = 1
_SecondDistance ("Second Distance", Float) = 2
_ThirdDistance ("Third Distance", Float) = 4
_FourthDistance ("Fourth Distance", Float) = 8
_FifthDistance ("Fifth Distance", Float) = 16
_SixthDistance ("Sixth Distance", Float) = 32
_Threshold ("Threshold", Range(0.0, 1.0)) = 1.
}
SubShader
{
Tags { "RenderType"="Opaque" }
CGPROGRAM
#pragma surface surf Lambert
sampler2D _MainTex;
struct Input
{
float2 uv_MainTex;
float3 worldPos;
};
float _FirstDistance;
float _SecondDistance;
float _ThirdDistance;
float _FourthDistance;
float _FifthDistance;
float _SixthDistance;
half4 _FirstColor;
half4 _SecondColor;
half4 _ThirdColor;
half4 _FourthColor;
half4 _FifthColor;
half4 _SixthColor;
half4 _distanceColor;
float _Threshold;
void surf (Input IN, inout SurfaceOutput o)
{
half4 c = tex2D (_MainTex, IN.uv_MainTex);
float dist = distance(_WorldSpaceCameraPos, IN.worldPos);
if(dist < _FirstDistance){
//half weight = 1.0;
_distanceColor = _FirstColor;
}
if(dist >= _FirstDistance && dist < _SecondDistance){
half weight = (dist - _FirstDistance) / (_SecondDistance - _FirstDistance);
_distanceColor = lerp(_FirstColor, _SecondColor, weight);
}
if(dist >= _SecondDistance && dist < _ThirdDistance){
half weight = (dist - _SecondDistance) / (_ThirdDistance - _SecondDistance);
_distanceColor = lerp(_SecondColor, _ThirdColor, weight);
}
if(dist >= _ThirdDistance && dist < _FourthDistance){
half weight = (dist - _ThirdDistance) / (_FourthDistance - _ThirdDistance);
_distanceColor = lerp(_ThirdColor, _FourthColor, weight);
}
if(dist >= _FourthDistance && dist < _FifthDistance){
half weight = (dist - _FourthDistance) / (_FifthDistance - _FourthDistance);
_distanceColor = lerp(_FourthColor, _FifthColor, weight);
}
if(dist >= _FifthDistance && dist < _SixthDistance){
half weight = (dist - _FifthDistance) / (_SixthDistance - _FifthDistance);
_distanceColor = lerp(_FifthColor, _SixthColor, weight);
}
if(dist >= _SixthDistance){
//half weight = 1;
_distanceColor = _SixthColor;
}
o.Albedo = c.rgb * _distanceColor.rgb;
o.Alpha = c.a;
o.Emission = c.rgb * pow(_distanceColor.rgb, _Threshold);
}
ENDCG
}
FallBack "Diffuse"
}
