void HeightMap::LoadMap(std::string mapfile)
{
...boring file stuff gets the heightmap data...
float *mapData=new float[m_mapLength*m_mapWidth*3];
m_indices=new int[m_mapLength*m_mapWidth*2];
m_tallestPoint=-HEIGHT_CONSTANT;
float tempHeight;
for(int x=0; x < m_mapWidth; ++x)
{
for(int z=0; z < m_mapLength; ++z)
{
int j=x+m_mapWidth*z;
mapData[3*j]=MAP_SPACING*x;
mapData[3*j+1]=GetHeight(x, z)
mapData[3*j+2]=MAP_SPACING*z;
}
}
int index=0;
for(int c=0; c < m_mapWidth*(m_mapLength-1); ++c)
{
m_indices[index++]=c;
m_indices[index++]=c + m_mapWidth;
}
m_dataID = dGeomTriMeshDataCreate();
dGeomTriMeshDataBuildSimple (m_dataID, (dReal*)mapData, m_mapLength*m_mapWidth,
m_indices, m_mapWidth*m_mapLength*2);
m_geomID = dCreateTriMesh(Entity::m_space, m_dataID, 0, 0, 0);
...boring VBO stuff...
}
Creating an ODE trimesh
Author
I keep getting errors when I create a trimesh in ODE from my heightmap, and I have no idea why. I've looked through tons of example code and it doesn't seem to help.
Here is my setup:
If I comment out the ODE lines, everything is great and the VBO displays, etc. With those two lines in, however, I get an Unhandled Exception: Access Violation on the dGeomTriMeshDataBuildSimple line.
What is going wrong?
I have not dived deeply into it but two thoughts come to mind:
1. Aren't the indices supposed to define triangles i.e. three indices per loop in:
2. Did you link with a build of ODE that includes trimesh support? Not all builds do; but they just might contain a dummy function that always throws an error.
Greetz,
Illco
1. Aren't the indices supposed to define triangles i.e. three indices per loop in:
m_indices[index++]=c;m_indices[index++]=c + m_mapWidth;2. Did you link with a build of ODE that includes trimesh support? Not all builds do; but they just might contain a dummy function that always throws an error.
Greetz,
Illco
Author
Ok, I'm fairly sure that it's problem #1 since I downloaded ODE with trimesh support.
I was specifying my old indices for a triangle strip, and understandably ODE doesn't like that. So I now have a new index array that puts in the redundent vertex like so:
That should work correctly, right? It's the vertex, the vertex above it, and the vertex next to it... boom, next triangle. But now I get a scary memory error in "heap_alloc_dbg" on this line:
Any idea what's going on now?
Thanks for the help!
I was specifying my old indices for a triangle strip, and understandably ODE doesn't like that. So I now have a new index array that puts in the redundent vertex like so:
int index=0; for(int c=0; c < m_mapWidth*(m_mapLength-1); ++c) { m_indices[index++]=c; m_indices[index++]=c + m_mapWidth; } int *physicsIndices=new int[m_mapWidth*m_mapLength*3]; index=0; for(int c=0; c < m_mapWidth*m_mapLength; ++c) { physicsIndices[index++]=c; physicsIndices[index++]=c+m_mapWidth; physicsIndices[index++]=c+1; } m_dataID = dGeomTriMeshDataCreate(); dGeomTriMeshDataBuildSimple (m_dataID, (dReal*)mapData, m_mapLength*m_mapWidth, physicsIndices, m_mapWidth*m_mapLength*3); m_geomID = dCreateTriMesh(Entity::m_space, m_dataID, 0, 0, 0); delete [] physicsIndices;That should work correctly, right? It's the vertex, the vertex above it, and the vertex next to it... boom, next triangle. But now I get a scary memory error in "heap_alloc_dbg" on this line:
/* fill data with silly value (but non-zero) */ memset((void *)pbData(pHead), _bCleanLandFill, nSize);Any idea what's going on now?
Thanks for the help!
Author
Ok, so I decided to use the test_trimesh trimesh to make sure everything was working ok.
So everything seems to work fine, but I get an error in my collide callback on this line:
I get a fat access violation.
Urrrrrrrrrrrrrgh this triangle collider is really making me mad ><
float Size[3], Vertices[15]; int Indices[12]; Size[0] = 5.0f; Size[1] = 5.0f; Size[2] = 2.5f; Vertices[0] = -Size[0]; Vertices[1] = -Size[1]; Vertices[2] = Size[2]; Vertices[3] = Size[0]; Vertices[4] = -Size[1]; Vertices[5] = Size[2]; Vertices[6] = Size[0]; Vertices[7] = Size[1]; Vertices[8] = Size[2]; Vertices[9] = -Size[0]; Vertices[10] = Size[1]; Vertices[11] = Size[2]; Vertices[12] = 0; Vertices[13] = 0; Vertices[14] = 0; Indices[0] = 0; Indices[1] = 1; Indices[2] = 4; Indices[3] = 1; Indices[4] = 2; Indices[5] = 4; Indices[6] = 2; Indices[7] = 3; Indices[8] = 4; Indices[9] = 3; Indices[10] = 0; Indices[11] = 4; dTriMeshDataID Data = dGeomTriMeshDataCreate(); dGeomTriMeshDataBuildSimple(Data, (dReal*)Vertices, 5, Indices, 12); m_geomID = dCreateTriMesh(Entity::m_space, Data, 0, 0, 0);So everything seems to work fine, but I get an error in my collide callback on this line:
****if (int numc = dCollide (o1,o2,MAX_CONTACTS,&contact[0].geom, sizeof(dContact))) { dMatrix3 RI; dRSetIdentity (RI); const dReal ss[3] = {0.02,0.02,0.02}; for (i=0; i<numc; i++) { dJointID c = dJointCreateContact (b.world,b.joints,contact+i); dJointAttach (c,b1,b2); } }I get a fat access violation.
Urrrrrrrrrrrrrgh this triangle collider is really making me mad ><
Your problem is that dVector3 in ODE is not defined as dReal[3] as anyone would asume, but as dReal[4].
When you cast your mapData array into a dReal, internaly dGeomTriMeshDataBuildSimple is expecting 4 floats per vertice not 3.
Try using dGeomTriMeshDataBuild paying atention to the "stride" parameter, I think you want it to be 3.
When you cast your mapData array into a dReal, internaly dGeomTriMeshDataBuildSimple is expecting 4 floats per vertice not 3.
Try using dGeomTriMeshDataBuild paying atention to the "stride" parameter, I think you want it to be 3.
Author
Quote:Original post by Kwizatz
Your problem is that dVector3 in ODE is not defined as dReal[3] as anyone would asume, but as dReal[4].
When you cast your mapData array into a dReal, internaly dGeomTriMeshDataBuildSimple is expecting 4 floats per vertice not 3.
Try using dGeomTriMeshDataBuild paying atention to the "stride" parameter, I think you want it to be 3.
Are you sure about this? Here is the example code from test_trimesh.cpp:
#define VertexCount 5#define IndexCount 12static dVector3 Size;static dVector3 Vertices[VertexCount];static int Indices[IndexCount];.... Size[0] = 5.0f; Size[1] = 5.0f; Size[2] = 2.5f; Vertices[0][0] = -Size[0]; Vertices[0][1] = -Size[1]; Vertices[0][2] = Size[2]; Vertices[1][0] = Size[0]; Vertices[1][1] = -Size[1]; Vertices[1][2] = Size[2]; Vertices[2][0] = Size[0]; Vertices[2][1] = Size[1]; Vertices[2][2] = Size[2]; Vertices[3][0] = -Size[0]; Vertices[3][1] = Size[1]; Vertices[3][2] = Size[2]; Vertices[4][0] = 0; Vertices[4][1] = 0; Vertices[4][2] = 0; Indices[0] = 0; Indices[1] = 1; Indices[2] = 4; Indices[3] = 1; Indices[4] = 2; Indices[5] = 4; Indices[6] = 2; Indices[7] = 3; Indices[8] = 4; Indices[9] = 3; Indices[10] = 0; Indices[11] = 4; dTriMeshDataID Data = dGeomTriMeshDataCreate(); dGeomTriMeshDataBuildSimple(Data, (dReal*)Vertices, VertexCount, Indices, IndexCount); TriMesh = dCreateTriMesh(space, Data, 0, 0, 0);Just to make sure, I did this with my own code:
int *physicsIndices=new int[m_mapWidth*m_mapLength*3]; dVector3 *physicsVertices=new dVector3[m_mapWidth*m_mapLength]; index=0; for(int i=0; i < m_mapWidth*m_mapLength; ++i) { physicsVertices[0]=mapData[index++]; physicsVertices[1]=mapData[index++]; physicsVertices[2]=mapData[index++]; } index=0; for(int c=0; c < m_mapWidth*m_mapLength; ++c) { physicsIndices[index++]=c; physicsIndices[index++]=c+m_mapWidth; physicsIndices[index++]=c+1; } m_dataID = dGeomTriMeshDataCreate(); dGeomTriMeshDataBuildSimple (m_dataID, (dReal*)physicsVertices, m_mapLength*m_mapWidth, physicsIndices, m_mapWidth*m_mapLength*3); m_geomID = dCreateTriMesh(Entity::m_space, m_dataID, 0, 0, 0); delete [] physicsIndices; delete [] physicsVertices;Same error =(
now your problem is declaring physicsVertices as dVector3[m_mapWidth*m_mapLength];
and then referencing it as physicsVertices[][]
try dVector3 *physicsVertices=new dVector3[m_mapWidth][m_mapLength] instead of
dVector3 *physicsVertices=new dVector3[m_mapWidth*m_mapLength]
Edit: scratch that, it may not work you may be better off accessing the array as a unidimentional array, so if declaring it as 2 dimentional didnt work, try it the other way around.
and then referencing it as physicsVertices[][]
try dVector3 *physicsVertices=new dVector3[m_mapWidth][m_mapLength] instead of
dVector3 *physicsVertices=new dVector3[m_mapWidth*m_mapLength]
Edit: scratch that, it may not work you may be better off accessing the array as a unidimentional array, so if declaring it as 2 dimentional didnt work, try it the other way around.
Author
I actually can't access it as a one-dimensional array... it gives me errors casting from float to dReal[4]. I essentially do the physicsVertices[x] and that returns a dReal[4]. Then I index into the dReal[4] by putting another set of brackets in there. It should work, theoretically.
Is there anything else I can try?
Is there anything else I can try?
This topic is closed to new replies.
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