void Unity_Spherize_float(float2 UV, float2 Center, float Strength, float2 Offset, out float2 Out)
{
float2 delta = UV - Center;
float delta2 = dot(delta.xy, delta.xy);
float delta4 = delta2 * delta2;
float2 delta_offset = delta4 * Strength;
Out = UV + delta * delta_offset + Offset;
}
This will generate spherical uv