koobas.hobune.stream
Saving changes made on a material from an editor script
I have an editor script generating a mesh, applying a material to that mesh, and updating some values on the material to pass on to a custom shader (The shader basically displays different colors according to mesh height) My problem is that the changes made on the material aren't saved. If I save the scene where my mesh is generated, the materials values are lost.
Here is a code snippet executed in my editor scripts that sets the materials values : ("material " is a public variable, set in unity inspector)
material.SetInt("baseColorCount", baseColors.Length);
material.SetColorArray("baseColors", baseColors);
material.SetFloatArray("baseStartHeights", baseStartHeights);
material.SetFloatArray("baseBlends", baseBlends);
meshGameObject.GetComponent<MeshRenderer>().sharedMaterial = material;
And here is the shader :
Shader "Custom/TerrainShader"
{
Properties
{
}
SubShader
{
Tags { "RenderType"="Opaque" }
LOD 200
CGPROGRAM
#pragma surface surf Standard fullforwardshadows
#pragma target 3.0
const static int maxColorCount = 10;
// To avoid potential div / 0 problems in inverseLerp
const static float epsilon = 1E-4;
int baseColorCount;
float3 baseColors[maxColorCount];
float baseStartHeights[maxColorCount];
float baseBlends[maxColorCount];
float minHeight;
float maxHeight;
struct Input
{
float3 worldPos;
};
float inverseLerp(float a, float b, float value) {
return saturate((value-a)/(b-a));
}
void surf (Input IN, inout SurfaceOutputStandard o)
{
float heightPercent = inverseLerp(minHeight, maxHeight, IN.worldPos.y);
for (int i = 0; i < baseColorCount; i++)
{
float drawStrength = inverseLerp(-baseBlends[i]/2 - epsilon, baseBlends[i]/2 - epsilon, heightPercent - baseStartHeights[i]);
o.Albedo = o.Albedo * (1 - drawStrength) + baseColors[i] * drawStrength;
}
}
ENDCG
}
FallBack "Diffuse"
}
Now after my code is executed, everything is ok : 
But if I save the scene for example, the material loses its values :
I tried loading the material from AssetsDatabase / Saving it with SaveAssets() but that didn't change anything.
I feel like I'm missing something but I can't figure it out.
What should I do so that the changes I made on a material in my editor script are actually saved on the material ?
I found a begining of a solution soon after posting this : Apparently I have to use Shader properties. But as I understand it, it's not possible to use arrays in shader properties.
The solution is to use Shader properties, they will be saved, unlike the values set with SetFloatArray, SetInt etc. But you can't use arrays in shader properties, which is sad :/
More info here : https://docs.unity3d.com/Manual/SL-Properties.html
