Question by captainfrogduh · Jul 24, 2017 at 12:58 PM · transform unity5 scale

Getting the complete size of the children and setting that to parent's size

Hi, so I am trying to make a 2D platformer game which has all these different platforms that are instantiated at random as the player moves along the screen. The problem is that I have a main platform prefab which has all these small bridges and tiles etc that are instantiated whenever the main prefab is created, the number of bridges is selected at random, so I can never tell the exact width of the platform before it is created.

So how do I calculate the complete width of the children of this main prefab and set it equal to the parent's width so I can calculate the total width of the platform?

The main parent prefab only has the Transform component and a script attached to it which generates all the smaller parts.

Here is my script for adding new platforms and instantiating them.

 void AddPlatforms(float farthestPlatformEndX) {
         // Get a random platform from the array of available Platforms
         int randPlatformIdx = Random.Range (0, availablePlatforms.Length);
 
         // Instantiate this platform
         GameObject platform = (GameObject)Instantiate (availablePlatforms [randPlatformIdx]);
 
         // size of the platform initiated
         float platformWidth = platform.transform.localScale.x;
         print ("Width of Platform: " + platformWidth);
 
         // Center of the position where the new platform will be placed
         float platformCenter = farthestPlatformEndX + platformWidth * 0.5f;
 
         // Set the position of the new platform
         float y_pos = 0.0f;
         if (randPlatformIdx == 0) {
             y_pos = -3.15f;
         } else if (randPlatformIdx == 1) {
             y_pos = -4.0f;
         }
         platform.transform.position = new Vector3(platformCenter + 3, y_pos, 0);
 
         // Store this instance of room in a list to delete later
         currentPlatforms.Add(platform);
 }

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