【UE4】普普通通的血条UI Shader

材质连线 和 custom节点里的代码：

//sdf

coords.x *= 8;

float2 pointOnLineSeg = float2(clamp(coords.x,0.5,7.5),0.5);

float sdf = distance(coords,pointOnLineSeg)*2 - 1;

clip(-sdf);

//border

float borderSdf = sdf + BorderSize;

float borderMask = step(0,-borderSdf);

return float4(borderMask.xxx,1);