/*
* Sets the shader uniforms that are necessary to project on screen the
* given TerrainQuad. This method can set the uniforms that are specific to
* the given quad.
*/
public virtual void SetUniforms(TerrainNode node, TerrainQuad quad, MaterialPropertyBlock matPropertyBlock)
{
if (matPropertyBlock == null || node == null || quad == null)
{
return;
}
double ox = quad.GetOX();
double oy = quad.GetOY();
double l = quad.GetLength();
double distFactor = (double)node.GetDistFactor();
int level = quad.GetLevel();
matPropertyBlock.AddVector(m_uniforms.offset, new Vector4((float)ox, (float)oy, (float)l, (float)level));
Vector3d2 camera = node.GetLocalCameraPos();
matPropertyBlock.AddVector(m_uniforms.camera, new Vector4((float)((camera.x - ox) / l), (float)((camera.y - oy) / l),
(float)((camera.z - node.GetView().GetGroundHeight()) / (l * distFactor)),
(float)camera.z));
Vector3d2 c = node.GetLocalCameraPos();
Matrix3x3d m = m_localToTangent * (new Matrix3x3d(l, 0.0, ox - c.x, 0.0, l, oy - c.y, 0.0, 0.0, 1.0));
matPropertyBlock.AddMatrix(m_uniforms.tileToTangent, m.ToMatrix4x4());
SetScreenUniforms(node, quad, matPropertyBlock);
}
/*
* Sets the shader uniforms that are necessary to project on screen the
* TerrainQuad of the given TerrainNode. This method can set the uniforms
* that are common to all the quads of the given terrain.
*/
public virtual void SetUniforms(TerrainNode node, Material mat)
{
if (mat == null || node == null)
{
return;
}
float d1 = node.GetSplitDist() + 1.0f;
float d2 = 2.0f * node.GetSplitDist();
mat.SetVector(m_uniforms.blending, new Vector2(d1, d2 - d1));
m_localToCamera = node.GetView().GetWorldToCamera() * node.GetLocalToWorld();
m_localToScreen = node.GetView().GetCameraToScreen() * m_localToCamera;
Vector3d2 localCameraPos = node.GetLocalCameraPos();
Vector3d2 worldCamera = node.GetView().GetWorldCameraPos();
Matrix4x4d A = LocalToDeformedDifferential(localCameraPos);
Matrix4x4d B = DeformedToTangentFrame(worldCamera);
Matrix4x4d ltot = B * node.GetLocalToWorld() * A;
m_localToTangent = new Matrix3x3d(ltot.m[0, 0], ltot.m[0, 1], ltot.m[0, 3],
ltot.m[1, 0], ltot.m[1, 1], ltot.m[1, 3],
ltot.m[3, 0], ltot.m[3, 1], ltot.m[3, 3]);
mat.SetMatrix(m_uniforms.localToScreen, m_localToScreen.ToMatrix4x4());
mat.SetMatrix(m_uniforms.localToWorld, node.GetLocalToWorld().ToMatrix4x4());
}
/**
* Sets the shader uniforms that are necessary to project on screen the
* given TerrainQuad. This method can set the uniforms that are specific to
* the given quad.
*/
public virtual void SetUniforms(TerrainNode node, TerrainQuad quad, MaterialPropertyBlock matPropertyBlock)
{
if(matPropertyBlock == null || node == null || quad == null) return;
double ox = quad.GetOX();
double oy = quad.GetOY();
double l = quad.GetLength();
double distFactor = (double)node.GetDistFactor();
int level = quad.GetLevel();
matPropertyBlock.AddVector(m_uniforms.offset, new Vector4((float)ox, (float)oy, (float)l, (float)level));
Vector3d2 camera = node.GetLocalCameraPos();
matPropertyBlock.AddVector(m_uniforms.camera, new Vector4( (float)((camera.x - ox) / l), (float)((camera.y - oy) / l),
(float)((camera.z - node.GetView().GetGroundHeight()) / (l * distFactor)),
(float)camera.z));
Vector3d2 c = node.GetLocalCameraPos();
Matrix3x3d m = m_localToTangent * (new Matrix3x3d(l, 0.0, ox - c.x, 0.0, l, oy - c.y, 0.0, 0.0, 1.0));
matPropertyBlock.AddMatrix(m_uniforms.tileToTangent, m.ToMatrix4x4());
SetScreenUniforms(node, quad, matPropertyBlock);
}
/**
* Sets the shader uniforms that are necessary to project on screen the
* TerrainQuad of the given TerrainNode. This method can set the uniforms
* that are common to all the quads of the given terrain.
*/
public virtual void SetUniforms(TerrainNode node, Material mat)
{
if(mat == null || node == null) return;
float d1 = node.GetSplitDist() + 1.0f;
float d2 = 2.0f * node.GetSplitDist();
mat.SetVector(m_uniforms.blending, new Vector2(d1, d2 - d1));
m_localToCamera = node.GetView().GetWorldToCamera() * node.GetLocalToWorld();
m_localToScreen = node.GetView().GetCameraToScreen() * m_localToCamera;
Vector3d2 localCameraPos = node.GetLocalCameraPos();
Vector3d2 worldCamera = node.GetView().GetWorldCameraPos();
Matrix4x4d A = LocalToDeformedDifferential(localCameraPos);
Matrix4x4d B = DeformedToTangentFrame(worldCamera);
Matrix4x4d ltot = B * node.GetLocalToWorld() * A;
m_localToTangent = new Matrix3x3d( ltot.m[0,0], ltot.m[0,1], ltot.m[0,3],
ltot.m[1,0], ltot.m[1,1], ltot.m[1,3],
ltot.m[3,0], ltot.m[3,1], ltot.m[3,3]);
mat.SetMatrix(m_uniforms.localToScreen, m_localToScreen.ToMatrix4x4());
mat.SetMatrix(m_uniforms.localToWorld, node.GetLocalToWorld().ToMatrix4x4());
}
/*
* Subdivides or unsubdivides this quad based on the current
* viewer distance to this quad, relatively to its size. This
* method uses the current viewer position provided by the
* TerrainNode to which this quadtree belongs.
*/
public void Update()
{
Frustum.VISIBILTY v = (m_parent == null) ? Frustum.VISIBILTY.PARTIALLY : m_parent.GetVisible();
if (v == Frustum.VISIBILTY.PARTIALLY)
{
m_visible = m_owner.GetVisibility(m_localBox);
}
else
{
m_visible = v;
}
// here we reuse the occlusion test from the previous frame:
// if the quad was found unoccluded in the previous frame, we suppose it is
// still unoccluded at this frame. If it was found occluded, we perform
// an occlusion test to check if it is still occluded.
if (m_visible != Frustum.VISIBILTY.INVISIBLE && m_occluded)
{
m_occluded = m_owner.IsOccluded(m_localBox);
if (m_occluded)
{
m_visible = Frustum.VISIBILTY.INVISIBLE;
}
}
double ground = m_owner.GetView().GetGroundHeight();
double dist = m_owner.GetCameraDist(new Box3d(m_ox, m_ox + m_length, m_oy, m_oy + m_length, Math.Min(0.0, ground), Math.Max(0.0, ground)));
if ((m_owner.GetSplitInvisibleQuads() || m_visible != Frustum.VISIBILTY.INVISIBLE) && dist < m_length * m_owner.GetSplitDist() && m_level < m_owner.GetMaxLevel())
{
if (IsLeaf())
{
Subdivide();
}
int[] order = new int[4];
double ox = m_owner.GetLocalCameraPos().x;
double oy = m_owner.GetLocalCameraPos().y;
double cx = m_ox + m_length / 2.0;
double cy = m_oy + m_length / 2.0;
if (oy < cy)
{
if (ox < cx)
{
order[0] = 0;
order[1] = 1;
order[2] = 2;
order[3] = 3;
}
else
{
order[0] = 1;
order[1] = 0;
order[2] = 3;
order[3] = 2;
}
}
else
{
if (ox < cx)
{
order[0] = 2;
order[1] = 0;
order[2] = 3;
order[3] = 1;
}
else
{
order[0] = 3;
order[1] = 1;
order[2] = 2;
order[3] = 0;
}
}
m_children[order[0]].Update();
m_children[order[1]].Update();
m_children[order[2]].Update();
m_children[order[3]].Update();
// we compute a more precise occlusion for the next frame (see above),
// by combining the occlusion status of the child nodes
m_occluded = (m_children[0].GetOccluded() && m_children[1].GetOccluded() && m_children[2].GetOccluded() && m_children[3].GetOccluded());
}
else
{
if (m_visible != Frustum.VISIBILTY.INVISIBLE)
{
// we add the bounding box of this quad to the occluders list
m_occluded = m_owner.AddOccluder(m_localBox);
if (m_occluded)
{
m_visible = Frustum.VISIBILTY.INVISIBLE;
}
}
if (!IsLeaf())
{
Release();
}
}
}
