Hey, ran into what I guess to be an issue with UnityWorldSpaceLightDir.
When I pass the vector into a fragment color I get this unexpected popping.
https://imgur.com/vG3t3I3
![alt text][1]
Seeing the color should represent the direction of the light source in world space. I would assume it to remain one color as long I don't change the rotation of the light (directional light in this case).
Shader used:
Shader "Debug/LightDirection"
{
Properties
{
[KeywordEnum(World, Object)] _Space("Space", Float) = 0
[Toggle] _Abs("Abs()", Float) = 0
}
SubShader
{
Tags{ "RenderType" = "Opaque" }
LOD 100
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 vertex : SV_POSITION;
float4 color : COLOR;
};
int _Space;
bool _Abs;
v2f vert(appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
float3 rgb;
switch (_Space)
{
case 0: {
rgb = UnityWorldSpaceLightDir(v.vertex);
} break;
case 1: {
rgb = ObjSpaceLightDir(v.vertex);
} break;
default: {} break;
}
if (_Abs)
{
rgb = abs(rgb);
}
o.color = float4(rgb, 1.0f);
return o;
}
fixed4 frag(v2f i) : SV_Target
{
return fixed4(i.color);
}
ENDCG
}
}
}
Ultimately what I'm trying to achieve is this;
https://realtimevfx.com/t/smoke-lighting-and-texture-re-usability-in-skull-bones/5339
But struggling in finding a solid way to get the lights direction relative to the normal of the particles. In the article it is said Light direction should be in tangent space to work.
[1]: https://imgur.com/vG3t3I3
PS: Feel a bit let down by markdown on this site as I can't for the life of me get a line break.
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