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Fix potential Grid shader accuracy issues

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#3229
This commit is contained in:
Wojciech Figat
2025-06-16 14:41:43 +02:00
parent d0817809ff
commit ea854a0f7b
2 changed files with 5 additions and 10 deletions
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Content/Shaders/Editor/Grid.flax
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Source/Shaders/Editor/Grid.shader
+3 -8
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@@ -3,7 +3,7 @@
// Ben Golus // Ben Golus
// https://bgolus.medium.com/the-best-darn-grid-shader-yet-727f9278b9d8#3e73 // https://bgolus.medium.com/the-best-darn-grid-shader-yet-727f9278b9d8#3e73
#define USE_FORWARD true; #define MIN_DERIV 0.00001f
#include "./Flax/Common.hlsl" #include "./Flax/Common.hlsl"
@@ -61,11 +61,6 @@ float remap(float origFrom, float origTo, float targetFrom, float targetTo, floa
return lerp(targetFrom, targetTo, rel); return lerp(targetFrom, targetTo, rel);
} }
float ddLength(float a)
{
return length(float2(ddx(a), ddy(a)));
}
float GetLine(float pos, float scale, float thickness) float GetLine(float pos, float scale, float thickness)
{ {
float lineWidth = thickness; float lineWidth = thickness;
@@ -73,7 +68,7 @@ float GetLine(float pos, float scale, float thickness)
float2 uvDDXY = float2(ddx(coord), ddy(coord)); float2 uvDDXY = float2(ddx(coord), ddy(coord));
float deriv = float(length(uvDDXY.xy)); float deriv = max(float(length(uvDDXY.xy)), MIN_DERIV);
float drawWidth = clamp(lineWidth, deriv, 0.5); float drawWidth = clamp(lineWidth, deriv, 0.5);
float lineAA = deriv * 1.5; float lineAA = deriv * 1.5;
float gridUV = abs(coord); float gridUV = abs(coord);
@@ -92,7 +87,7 @@ float GetGrid(float3 pos, float scale, float thickness)
float4 uvDDXY = float4(ddx(coord), ddy(coord)); float4 uvDDXY = float4(ddx(coord), ddy(coord));
float2 deriv = float2(length(uvDDXY.xz), length(uvDDXY.yw)); float2 deriv = max(float2(length(uvDDXY.xz), length(uvDDXY.yw)), float2(MIN_DERIV, MIN_DERIV));
float2 drawWidth = clamp(lineWidth, deriv, 0.5); float2 drawWidth = clamp(lineWidth, deriv, 0.5);
float2 lineAA = deriv * 1.5; float2 lineAA = deriv * 1.5;
float2 gridUV = 1.0 - abs(frac(coord) * 2.0 - 1.0); float2 gridUV = 1.0 - abs(frac(coord) * 2.0 - 1.0);