| public SetExtents ( Vector3 min, Vector3 max ) : void | ||
| min | Vector3 | |
| max | Vector3 | |
| return | void | |
/// <summary>
/// Sets the corners of the rectangle, in relative coordinates.
/// </summary>
/// <param name="left">Left position in screen relative coordinates, -1 = left edge, 1.0 = right edge.</param>
/// <param name="top">Top position in screen relative coordinates, 1 = top edge, -1 = bottom edge.</param>
/// <param name="right">Position in screen relative coordinates.</param>
/// <param name="bottom">Position in screen relative coordinates.</param>
/// <param name="updateAABB"></param>
public void SetCorners( float left, float top, float right, float bottom, bool updateAABB )
{
var data = new float[]
{
left, top, -1, left, bottom, -1, right, top, -1, // Fix for Issue #1187096
right, bottom, -1
};
var buffer = vertexData.vertexBufferBinding.GetBuffer( POSITION );
buffer.WriteData( 0, buffer.Size, data, true );
if ( updateAABB )
{
box = new AxisAlignedBox();
box.SetExtents( new Vector3( left, top, 0 ), new Vector3( right, bottom, 0 ) );
}
}
/// <summary>
/// Internal method for locating a list of shadow casters which
/// could be affecting the frustum for a given light.
/// </summary>
/// <remarks>
/// Custom scene managers are encouraged to override this method to add optimizations,
/// and to add their own custom shadow casters (perhaps for world geometry)
/// </remarks>
/// <param name="light"></param>
/// <param name="camera"></param>
protected virtual IList FindShadowCastersForLight( Light light, Camera camera )
{
this.shadowCasterList.Clear();
if ( light.Type == LightType.Directional )
{
// Basic AABB query encompassing the frustum and the extrusion of it
AxisAlignedBox aabb = new AxisAlignedBox();
Vector3[] corners = camera.WorldSpaceCorners;
Vector3 min, max;
Vector3 extrude = light.DerivedDirection * -this.shadowDirLightExtrudeDist;
// do first corner
min = max = corners[ 0 ];
min.Floor( corners[ 0 ] + extrude );
max.Ceil( corners[ 0 ] + extrude );
for ( int c = 1; c < 8; ++c )
{
min.Floor( corners[ c ] );
max.Ceil( corners[ c ] );
min.Floor( corners[ c ] + extrude );
max.Ceil( corners[ c ] + extrude );
}
aabb.SetExtents( min, max );
if ( this.shadowCasterAABBQuery == null )
{
this.shadowCasterAABBQuery = this.CreateAABBRegionQuery( aabb );
}
else
{
this.shadowCasterAABBQuery.Box = aabb;
}
// Execute, use callback
this.shadowCasterQueryListener.Prepare( false,
light.GetFrustumClipVolumes( camera ),
light,
camera,
this.shadowCasterList,
light.ShadowFarDistanceSquared );
this.shadowCasterAABBQuery.Execute( this.shadowCasterQueryListener );
}
else
{
Sphere s = new Sphere( light.DerivedPosition, light.AttenuationRange );
// eliminate early if camera cannot see light sphere
if ( camera.IsObjectVisible( s ) )
{
// create or init a sphere region query
if ( this.shadowCasterSphereQuery == null )
{
this.shadowCasterSphereQuery = this.CreateSphereRegionQuery( s );
}
else
{
this.shadowCasterSphereQuery.Sphere = s;
}
// check if the light is within view of the camera
bool lightInFrustum = camera.IsObjectVisible( light.DerivedPosition );
PlaneBoundedVolumeList volumeList = null;
// Only worth building an external volume list if
// light is outside the frustum
if ( !lightInFrustum )
{
volumeList = light.GetFrustumClipVolumes( camera );
}
// prepare the query and execute using the callback
this.shadowCasterQueryListener.Prepare(
lightInFrustum,
volumeList,
light,
camera,
this.shadowCasterList,
light.ShadowFarDistanceSquared );
this.shadowCasterSphereQuery.Execute( this.shadowCasterQueryListener );
}
}
return this.shadowCasterList;
}
/// <summary>
/// Utility method for extruding a bounding box.
/// </summary>
/// <param name="box">Original bounding box, will be updated in-place.</param>
/// <param name="lightPosition">4D light position in object space, when w=0.0f this
/// represents a directional light</param>
/// <param name="extrudeDistance">The distance to extrude.</param>
protected virtual void ExtrudeBounds( AxisAlignedBox box, Vector4 lightPosition, float extrudeDistance )
{
Vector3 extrusionDir = Vector3.Zero;
if ( lightPosition.w == 0 )
{
extrusionDir.x = -lightPosition.x;
extrusionDir.y = -lightPosition.y;
extrusionDir.z = -lightPosition.z;
extrusionDir.Normalize();
extrusionDir *= extrudeDistance;
box.SetExtents( box.Minimum + extrusionDir, box.Maximum + extrusionDir );
}
else
{
Vector3[] corners = box.Corners;
Vector3 vmin = new Vector3();
Vector3 vmax = new Vector3();
for ( int i = 0; i < 8; i++ )
{
extrusionDir.x = corners[ i ].x - lightPosition.x;
extrusionDir.y = corners[ i ].y - lightPosition.y;
extrusionDir.z = corners[ i ].z - lightPosition.z;
extrusionDir.Normalize();
extrusionDir *= extrudeDistance;
Vector3 res = corners[ i ] + extrusionDir;
if ( i == 0 )
{
vmin = res;
vmax = res;
}
else
{
vmin.Floor( res );
vmax.Ceil( res );
}
}
box.SetExtents( vmin, vmax );
}
}
/// <summary>
/// IsObjectVisible() function for portals.
/// </summary>
/// <remarks>
/// Everything needs to be updated spatially before this function is
/// called including portal corners, frustum planes, etc.
/// </remarks>
/// <param name="portal">
/// The <see cref="Portal"/> to check visibility against.
/// </param>
/// <returns>
/// true if the Portal is visible.
/// </returns>
public bool IsObjectVisible( Portal portal )
{
// if portal isn't open, it's not visible
if ( !portal.IsOpen )
{
return false;
}
// if the frustum has no planes, just return true
if ( mActiveCullingPlanes.Count == 0 )
{
return true;
}
// check if this portal is already in the list of active culling planes (avoid
// infinite recursion case)
foreach ( PCPlane plane in mActiveCullingPlanes )
{
if ( plane.Portal == portal )
{
return false;
}
}
// if portal is of type AABB or Sphere, then use simple bound check against planes
if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_AABB )
{
AxisAlignedBox aabb = new AxisAlignedBox();
aabb.SetExtents( portal.getDerivedCorner( 0 ), portal.getDerivedCorner( 1 ) );
return IsObjectVisible( aabb );
}
else if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_SPHERE )
{
return IsObjectVisible( portal.getDerivedSphere() );
}
// check if the portal norm is facing the frustum
Vector3 frustumToPortal = portal.getDerivedCP() - mOrigin;
Vector3 portalDirection = portal.getDerivedDirection();
Real dotProduct = frustumToPortal.Dot( portalDirection );
if ( dotProduct > 0 )
{
// portal is faced away from Frustum
return false;
}
// check against frustum culling planes
bool visible_flag;
// Check originPlane if told to
if ( mUseOriginPlane )
{
// set the visible flag to false
visible_flag = false;
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = mOriginPlane.GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then the origin plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
return false;
}
}
// For each active culling plane, see if all portal points are on the negative
// side. If so, the portal is not visible
foreach ( PCPlane plane in mActiveCullingPlanes )
{
visible_flag = false;
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = plane.GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
return false;
}
}
// no plane culled all the portal points and the norm
// was facing the frustum, so this portal is visible
return true;
}
public unsafe void Initialize( int startx, int startz, Real[] pageHeightData )
{
if ( mOptions.maxGeoMipMapLevel != 0 )
{
int i = (int)1 << ( mOptions.maxGeoMipMapLevel - 1 );
if ( ( i + 1 ) > mOptions.tileSize )
{
LogManager.Instance.Write( "Invalid maximum mipmap specifed, must be n, such that 2^(n-1)+1 < tileSize \n" );
return;
}
}
DeleteGeometry();
//calculate min and max heights;
Real min = 256000, max = 0;
mTerrain = new VertexData();
mTerrain.vertexStart = 0;
mTerrain.vertexCount = mOptions.tileSize * mOptions.tileSize;
renderOperation.useIndices = true;
renderOperation.operationType = mOptions.useTriStrips ? OperationType.TriangleStrip : OperationType.TriangleList;
renderOperation.vertexData = mTerrain;
renderOperation.indexData = GetIndexData();
VertexDeclaration decl = mTerrain.vertexDeclaration;
VertexBufferBinding bind = mTerrain.vertexBufferBinding;
// positions
int offset = 0;
decl.AddElement( MAIN_BINDING, offset, VertexElementType.Float3, VertexElementSemantic.Position );
offset += VertexElement.GetTypeSize( VertexElementType.Float3 );
if ( mOptions.lit )
{
decl.AddElement( MAIN_BINDING, offset, VertexElementType.Float3, VertexElementSemantic.Position );
offset += VertexElement.GetTypeSize( VertexElementType.Float3 );
}
// texture coord sets
decl.AddElement( MAIN_BINDING, offset, VertexElementType.Float2, VertexElementSemantic.TexCoords, 0 );
offset += VertexElement.GetTypeSize( VertexElementType.Float2 );
decl.AddElement( MAIN_BINDING, offset, VertexElementType.Float2, VertexElementSemantic.TexCoords, 1 );
offset += VertexElement.GetTypeSize( VertexElementType.Float2 );
if ( mOptions.coloured )
{
decl.AddElement( MAIN_BINDING, offset, VertexElementType.Color, VertexElementSemantic.Diffuse );
offset += VertexElement.GetTypeSize( VertexElementType.Color );
}
// Create shared vertex buffer
mMainBuffer =
HardwareBufferManager.Instance.CreateVertexBuffer( decl.Clone( MAIN_BINDING ), mTerrain.vertexCount, BufferUsage.StaticWriteOnly );
// Create system memory copy with just positions in it, for use in simple reads
//mPositionBuffer = OGRE_ALLOC_T(float, mTerrain.vertexCount * 3, MEMCATEGORY_GEOMETRY);
mPositionBuffer = new float[ mTerrain.vertexCount * 3 ];
bind.SetBinding( MAIN_BINDING, mMainBuffer );
if ( mOptions.lodMorph )
{
// Create additional element for delta
decl.AddElement( DELTA_BINDING, 0, VertexElementType.Float1, VertexElementSemantic.BlendWeights );
// NB binding is not set here, it is set when deriving the LOD
}
mInit = true;
mRenderLevel = 0;
mMinLevelDistSqr = new Real[ mOptions.maxGeoMipMapLevel ];
int endx = startx + mOptions.tileSize;
int endz = startz + mOptions.tileSize;
Vector3 left, down, here;
VertexElement poselem = decl.FindElementBySemantic( VertexElementSemantic.Position );
VertexElement texelem0 = decl.FindElementBySemantic( VertexElementSemantic.TexCoords, 0 );
VertexElement texelem1 = decl.FindElementBySemantic( VertexElementSemantic.TexCoords, 1 );
//fixed ( float* pSysPos = mPositionBuffer )
{
int pos = 0;
byte* pBase = (byte*)mMainBuffer.Lock( BufferLocking.Discard );
for ( int j = startz; j < endz; j++ )
{
for ( int i = startx; i < endx; i++ )
{
float* pPos = (float*)( pBase + poselem.Offset );
float* pTex0 = (float*)( pBase + texelem0.Offset );
float* pTex1 = (float*)( pBase + texelem1.Offset );
//poselem.baseVertexPointerToElement(pBase, &pPos);
//texelem0.baseVertexPointerToElement(pBase, &pTex0);
//texelem1.baseVertexPointerToElement(pBase, &pTex1);
Real height = pageHeightData[ j * mOptions.pageSize + i ];
height = height * mOptions.scale.y; // scale height
//*pSysPos++ = *pPos++ = (float) i*mOptions.scale.x; //x
//*pSysPos++ = *pPos++ = height; // y
//*pSysPos++ = *pPos++ = (float) j*mOptions.scale.z; //z
mPositionBuffer[ pos++ ] = *pPos++ = (float)i * mOptions.scale.x; //x
mPositionBuffer[ pos++ ] = *pPos++ = height; // y
mPositionBuffer[ pos++ ] = *pPos++ = (float)j * mOptions.scale.z; //z
*pTex0++ = (float)i / (float)( mOptions.pageSize - 1 );
*pTex0++ = (float)j / (float)( mOptions.pageSize - 1 );
*pTex1++ = ( (float)i / (float)( mOptions.tileSize - 1 ) ) * mOptions.detailTile;
*pTex1++ = ( (float)j / (float)( mOptions.tileSize - 1 ) ) * mOptions.detailTile;
if ( height < min )
min = (Real)height;
if ( height > max )
max = (Real)height;
pBase += mMainBuffer.VertexSize;
}
}
mMainBuffer.Unlock();
mBounds = new AxisAlignedBox();
mBounds.SetExtents( new Vector3( (Real)startx * mOptions.scale.x, min, (Real)startz * mOptions.scale.z ),
new Vector3( (Real)( endx - 1 ) * mOptions.scale.x, max,
(Real)( endz - 1 ) * mOptions.scale.z ) );
mCenter = new Vector3( ( startx * mOptions.scale.x + ( endx - 1 ) * mOptions.scale.x ) / 2,
( min + max ) / 2,
( startz * mOptions.scale.z + ( endz - 1 ) * mOptions.scale.z ) / 2 );
boundingRadius = Math.Sqrt(
Utility.Sqr( max - min ) +
Utility.Sqr( ( endx - 1 - startx ) * mOptions.scale.x ) +
Utility.Sqr( ( endz - 1 - startz ) * mOptions.scale.z ) ) / 2;
// Create delta buffer list if required to morph
if ( mOptions.lodMorph )
{
// Create delta buffer for all except the lowest mip
mDeltaBuffers = new AxiomSortedCollection<int, HardwareVertexBuffer>( mOptions.maxGeoMipMapLevel - 1 );
}
Real C = CalculateCFactor();
CalculateMinLevelDist2( C );
}
}