Get plain coordinates for another object

Question

Hello everyone,

I have a very interesting question that is boggling my mind. (I can't find reference or a book about this)

Preceived Outcome: Gameobject aka "Ship" is on the plain mesh "water" and waves come in that move the position/rotation of the ship to look 'realistic'.

Problem: I'm using "water" mesh filter changes shape and does not impact x,y,z. I'm using Mathf.Sin in a loop with baseheight[i] to get new values for mesh.RecalculateNormals() that creates the wave like motion.

How can I get the coordinates of the baseHeight and tell my ship it needs to raise or lower on the "water" plane?

//wave script Mesh mesh = GetComponent().mesh;

   if (baseHeight == null)
       baseHeight = mesh.vertices;

    vertices = new Vector3[baseHeight.Length];

     
   for (int i = 0; i < vertices.Length; i++)
   {
       Vector3 vertex = baseHeight[i];
       vertex.y += Mathf.Sin(Time.time * speed + baseHeight[i].x + baseHeight[i].y + baseHeight[i].z) * scale;
     
       vertices[i] = vertex;
   }
  mesh.vertices = vertices;
   mesh.RecalculateNormals();

alt text

Answer 1

Answer by Cornelis-de-Jager · Mar 23, 2018 at 05:18 AM

Use a RayCast from the ships position downward.

Then you can use in built functions for RayCastHit object to find the normal which I think is

   Vector3 normal = hit.normal;

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sentar · Mar 23, 2018 at 06:03 AM 0

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It looks like it keeps it consistently on 0 with this method (correct me if i'm wrong).

RaycastHit hit;

     Physics.Raycast(this.transform.position, -Vector3.up, out hit, 0.5f);

     Vector3 normal = hit.normal;

     Debug.Log("raycast hits" + hit.normal);

     transform.position = new Vector3(transform.position.x, normal.y, transform.position.z);

Gives this outcome: alt text

floating-boat-on-mesh-error.png (221.0 kB)

sentar · Mar 23, 2018 at 06:05 AM 0

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Here are some of the vertices layed out on the plain. which unfortunately are not 0 and 1 all the time. :/

alt text

wave-vertices.png (19.7 kB)

sentar · Mar 23, 2018 at 06:16 AM 0

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Hey sorry, I removed the distance of the raycast and now it consistently is giving 1's & 0's but nothing in between.

Cornelis-de-Jager sentar · Mar 23, 2018 at 06:22 AM 0

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Hey, after having a closer look it seems your collider for your water mesh is not a mesh collider but rather a box collider. Try changing that.

sentar · Mar 23, 2018 at 10:41 PM 0

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I thought that originally but this is a mesh collider

alt text

water-plane-collider.png (297.8 kB)

Bunny83 · Mar 23, 2018 at 11:47 PM 0

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You can't use a raycast in this case as it's impractical to update a meshcollider every frame. This would totally kill the performance. $$anonymous$$eshColliders do not update themselfs.

Answer 2

This is the closest I could get with my current understanding. This is part of the script to create float on a ship object.

foreach(Vector3 ocean_verts in sealevel.GetComponent().vertices) {

           if (transform.position.x < ocean_verts.x && transform.position.z < ocean_verts.z)
        {
             transform.position = new Vector3(transform.position.x, ocean_verts.y + 0.2f * Time.deltaTime, transform.position.z);
             transform.rotation = Quaternion.Euler(-ocean_verts.y * Time.deltaTime, transform.localEulerAngles.y, ocean_verts.y * Time.fixedDeltaTime * sealevel.GetComponent<my_ocean>().scale * 360);
             //transform.Rotate(-ocean_verts.y * Time.deltaTime, transform.localRotation.y, ocean_verts.z * Time.deltaTime);
         }

            if (transform.position.x < ocean_verts.x && transform.position.z > ocean_verts.z)
            {
                transform.position = new Vector3(transform.position.x, ocean_verts.y + 0.2f * Time.deltaTime, transform.position.z);
                transform.rotation = Quaternion.Euler(-ocean_verts.y * Time.deltaTime, transform.localEulerAngles.y, ocean_verts.y * Time.fixedDeltaTime * sealevel.GetComponent<my_ocean>().scale * 360);
                //transform.Rotate(-ocean_verts.y * Time.deltaTime, transform.localRotation.y, ocean_verts.z * Time.deltaTime);
            }

            if (transform.position.x > ocean_verts.x && transform.position.z > ocean_verts.z)
            {
                transform.position = new Vector3(transform.position.x, ocean_verts.y + 0.2f * Time.deltaTime, transform.position.z);
                transform.rotation = Quaternion.Euler(-ocean_verts.y * Time.deltaTime, transform.localEulerAngles.y, ocean_verts.y * Time.fixedDeltaTime * sealevel.GetComponent<my_ocean>().scale * 360);
                //transform.Rotate(-ocean_verts.y * Time.deltaTime, transform.localRotation.y, ocean_verts.z * Time.deltaTime);
            }

            if (transform.position.x > ocean_verts.x && transform.position.z < ocean_verts.z)
            {
                transform.position = new Vector3(transform.position.x, ocean_verts.y + 0.2f * Time.deltaTime, transform.position.z);
                transform.rotation = Quaternion.Euler(-ocean_verts.y * Time.deltaTime, transform.localEulerAngles.y, ocean_verts.y * Time.fixedDeltaTime * sealevel.GetComponent<my_ocean>().scale * 360);
                //transform.Rotate(-ocean_verts.y * Time.deltaTime, transform.localRotation.y, ocean_verts.z * Time.deltaTime);
            }
     }

Get plain coordinates for another object

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