public static GameObject CreateFluidDecal( 
   DecalType decalType, 
   Vector3 point, 
   Vector3 forward, 
   GameObject obj, 
   Vector3 decalWoldUpVector, 
   Material materialOverride 
);

 
RaycastHit hit; 
Ray ray = Camera.main.ViewportPointToRay(new Vector3(0.5F, 0.5F, 0)); 
bool wasHit = Physics.Raycast(ray, out hit); 
 
 if (wasHit) 
        { 
            Material m = null; 
            if (hit.collider.gameObject.renderer) 
            { 
                //Get material instanse 
                m = Instantiate(i_flow.i_material) as Material; 
 
                //Get bump from hited surface 
 
if(hit.collider.gameObject.renderer.sharedMaterial.HasProperty("_BumpMap")) 
                { 
                    Texture2D bumpMap = 
hit.collider.gameObject.renderer.sharedMaterial.GetTexture("_BumpMap") as 
Texture2D; 
                    Vector2 bumpScale = 
hit.collider.gameObject.renderer.sharedMaterial.GetTextureScale("_BumpMap"); 
                    Vector2 bumpOffset = 
hit.collider.gameObject.renderer.sharedMaterial.GetTextureOffset("_BumpMap"); 
                    //Setup new bump 
                    m.SetTexture("_SourceBumpMap", bumpMap); 
                    m.SetTextureScale("_SourceBumpMap", bumpScale); 
                    m.SetTextureOffset("_SourceBumpMap", bumpOffset); 
                  } 
                else 
                { 
                     m.SetTexture("_SourceBumpMap", null); 
                } 
                //Flow decal 
                DecalCreator.CreateFluidDecal(i_flow, hit.point, ray.direction, 
hit.collider.gameObject, m); 
            } 
 }