A plane node?

[ent1ty]

Hi,
so it's easy to add a cube or even sphere, but how do i add a simple plane? Basically, something like a billboard that doesn't rotate to the camera.
Thanks.

[arras]

Code: Select all

scene::SMesh* createPlaneMesh(f32 width = 1.f, f32 height = 1.f)
{
   video::S3DVertex v0(0.f,0.f,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 0.f,1.f);

   video::S3DVertex v1(width,0.f,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 1.f,1.f);

   video::S3DVertex v2(width,height,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 1.f,0.f);

   video::S3DVertex v3(0.f,height,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 0.f,0.f);

   scene::CMeshBuffer<video::S3DVertex> *buffer =
      new scene::CMeshBuffer<video::S3DVertex>;

   buffer->Vertices.push_back(v0);
   buffer->Vertices.push_back(v1);
   buffer->Vertices.push_back(v2);
   buffer->Vertices.push_back(v3);

   buffer->Indices.push_back(0);
   buffer->Indices.push_back(1);
   buffer->Indices.push_back(2);

   buffer->Indices.push_back(0);
   buffer->Indices.push_back(2);
   buffer->Indices.push_back(3);

   buffer->recalculateBoundingBox();

   scene::SMesh *mesh = new scene::SMesh;
   mesh->addMeshBuffer(buffer);
   buffer->drop();
   mesh->recalculateBoundingBox();

   return mesh;
}

Code: Select all

scene::ISceneNode* createPlaneSceneNode(scene::ISceneManager* smgr,
   scene::ISceneNode *parent = NULL, s32 id = -1,
   core::vector3d<f32> position = core::vector3d<f32>(0.f,0.f,0.f),
   f32 width = 1.f, f32 height = 1.f)
{
   video::S3DVertex v0(0.f,0.f,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 0.f,1.f);

   video::S3DVertex v1(width,0.f,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 1.f,1.f);

   video::S3DVertex v2(width,height,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 1.f,0.f);

   video::S3DVertex v3(0.f,height,0.f, 0.f,0.f,1.f,
      video::SColor(255,255,255,255), 0.f,0.f);

   scene::CMeshBuffer<video::S3DVertex> *buffer =
      new scene::CMeshBuffer<video::S3DVertex>;

   buffer->Vertices.push_back(v0);
   buffer->Vertices.push_back(v1);
   buffer->Vertices.push_back(v2);
   buffer->Vertices.push_back(v3);

   buffer->Indices.push_back(0);
   buffer->Indices.push_back(1);
   buffer->Indices.push_back(2);

   buffer->Indices.push_back(0);
   buffer->Indices.push_back(2);
   buffer->Indices.push_back(3);

   buffer->recalculateBoundingBox();

   scene::SMesh *mesh = new scene::SMesh;
   mesh->addMeshBuffer(buffer);
   buffer->drop();
   mesh->recalculateBoundingBox();

   scene::ISceneNode *plane = smgr->addMeshSceneNode(mesh, parent, id);
   mesh->drop();
   plane->setPosition(position);

   return plane;
}

[hybrid]

Irrlicht 1.7 also has its own createPlaneMesh function in geometry creator. Just add that mesh to a mesh scene node.

[ent1ty]

Ah, nice, I was only looking in ISceneManager.
Thanks.

[vhson13]

I applied code above, but scene node does not render. I don't know why? Could you explain for me? Thanks everyone.

[randomMesh]

I applied code above, but scene node does not render. I don't know why? Could you explain for me? Thanks everyone.

It's hard to tell without code.

[arras]

Try turning off backface culling. There is chance, you look at plane from wrong side. It is facing along Z axis.

[EDIT:] ops, sorry, it was actually facing opposite way, along -Z axis. I just copy/pasted that code from one of my applications. Corrected. Now it should face along Z properly.

[SG57]

You can also use the built-in hill plane mesh creator. Simply set the amount of tiles to (1,1) and each tile the size of the plane you want. You can even set the texture repeat rate this way so that saves you some hassle.

I used this as my floor and walls in my Light Cycle game, worked well.

[vhson13]

I tried hill plane mesh, it's a good idea for me. I did as guide in tutorial about special FX using addMeshSceneNode instead of addWaterSurfaceSceneNode, and got ugly render, plane was not rendered well. I don't know why?

My purpose is creating a plane mesh and then changing color of some tiles when needed. How can I solve this problem below and move next step?

[hybrid]

You cannot color separate tiles. The surrounding ones will be affected by such changes as well. It doesn't matter if you use textures or vertex colors, both will have an effect on the neighbors as well.