void Update () {

        TerrainData terrainData = Terrain.activeTerrain.terrainData;
        float[, ,] splatmapData = new float[terrainData.alphamapWidth, terrainData.alphamapHeight, terrainData.alphamapLayers];


        GameObject vehicle = GameObject.Find("JD6510");
        Vector3 trpos = vehicle.transform.position;

        trpos = trpos / Terrain.activeTerrain.terrainData.size.x;   //Used X because i couldn't devide a vector by a vector.

        trpos = trpos * (terrainData.alphamapWidth * terrainData.alphamapHeight);

        splatmapData[(int)trpos.x, (int)trpos.y, 0] = 0;
        splatmapData[(int)trpos.x, (int)trpos.y, 1] = 1;
        splatmapData[(int)trpos.x, (int)trpos.y, 2] = 0;


        // and finally assign the new splatmap to the terrainData:
        terrainData.SetAlphamaps(0, 0, splatmapData);
    }