Modify heightField in real time

[kikosmalltalk]

Hi all

I have a question over the heightfield collision primitive.
I can modify the primitive in real time ?
Or should i create a new primitive ?

Advanced thanks

kiko

[Leadwerks]

You can modify the heightfield in real-time.

[kikosmalltalk]

Hi Leadwerk

Thanks.
I'm looking the samples and the heightfield functions . I not found functions for this.
Please any example or help ?.

Thanks again

kiko

[JernejL]

I think the heightfield always uses original data, so you can just change the original data.

[Julio Jerez]

from the 2.2 SDK file \toolBox\HeightFieldPrimitive.cpp
here is how you can modify hieghtMap in real time

Code: Select all

   NewtonCollisionInfoRecord collisionInfo;
   memset (&collisionInfo, 0, sizeof (NewtonCollisionInfoRecord));
   NewtonCollisionGetInfo (collision, &collisionInfo);
   if (collisionInfo.m_collisionType == SERIALIZE_ID_HEIGHTFIELD) {
          int width;
                int height;
          unsigned short* elevations;

      width = collisionInfo.m_heightField.m_width;
      height = collisionInfo.m_heightField.m_height;

      // this is the elevation data, the application can use this to modify the terrain on the flight
      elevations = collisionInfo.m_heightField.m_elevation;

      // I am am usin elvation data to build a visual mesh
      geometry = new OGLMesh(dMesh::D_STATIC_MESH);
      AddMesh (geometry);
      geometry->Release();
                                         ....
   }

[kikosmalltalk]

Hi all

Thanks.
I'm using Truevision3d, this has a TVLandscape object for creation terrain.
The terrain it may be modified in real time

Julio wrote:
from the 2.2 SDK file \toolBox\HeightFieldPrimitive.cpp
here is how you can modify hieghtMap in real time

I want to make the inverse. To modify the TVLandscape in real time and then to use these data in the heightfield of newton.

Delfi wrote:
I think the heightfield always uses original data, so you can just change the original data.

How ?.
Making one new heightfield each time which I modify the Newfoundland.


Advanced thanks

kiko

[JernejL]

See the advice julio gave you 1 post up (viewtopic.php?f=9&t=5210#p37152)

[Aphex]

This is how I modify mine dynamically:

Code: Select all

   const int vertIndex = change.mHtmapY*mHeightMap->Width() + change.mHtmapX;
   NewtonCollisionInfoRecord collisionInfo;
   NewtonCollisionGetInfo(NewtonBodyGetCollision(mPhysicsBody), &collisionInfo);
   collisionInfo.m_heightField.m_elevation[vertIndex] = change.mNewVal;


[zorgblaubaer]

hi aphex,

could you explain a bit more detailed how you use this to modify the heightmap? i am new to newton and can only make use of it when i know how this dynamic heightmap modifying works.

thanks in advance!

edit: more detailed my problem is to get a collision from my heightmap so that i can give it as an argument in the NewtonCollisionGetInfo function... or what exactly shall this argument be? the function needs to know which heightmap it should edit, doenst it?
edit2: i figured out how to do it. the heightmap now changes, but its geometry doesnt. how do i do this/ ;((

[zorgblaubaer]

i still was not able to find out how the visuals of my heightmap can update together with the collision model.
the collision/heightmap change works nice, but the OGL object stays in its initialization state ;(

[JernejL]

i still was not able to find out how the visuals of my heightmap can update together with the collision model.
the collision/heightmap change works nice, but the OGL object stays in its initialization state ;(

This is not a newton problem, you need to rebuild your graphical model's geometry cache.

[zorgblaubaer]

yes, and its working now. thanks!