} // RenderColumnVertices()
#endregion
#region Unit Testing
#if DEBUG
/// <summary>
/// Test column vertices
/// </summary>
static public void TestColumnVertices()
{
TrackColumns colunms = null;
TestGame.Start(
delegate
{
colunms = new TrackColumns(new List <TrackVertex>(), null);
},
delegate
{
// Draw the line for each line part
for (int num = 0; num < colunms.BaseColumnVertices.Length - 1; num++)
{
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num + 1].pos,
Color.White);
}
// Show normal and tangent vectors for each point
for (int num = 0; num < colunms.BaseColumnVertices.Length; num++)
{
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num].pos +
colunms.BaseColumnVertices[num].normal * 10,
Color.Red);
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num].pos +
colunms.BaseColumnVertices[num].tangent * 10,
Color.Blue);
} // for (num)
});
} // TestColumnVertices()
/// <summary>
/// Test column vertices
/// </summary>
public static void TestColumnVertices()
{
TrackColumns colunms = null;
TestGame.Start(
delegate
{
colunms = new TrackColumns(new List<TrackVertex>(), null);
},
delegate
{
// Draw the line for each line part
for (int num = 0; num < colunms.BaseColumnVertices.Length - 1; num++)
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num + 1].pos,
Color.White);
// Show normal and tangent vectors for each point
for (int num = 0; num < colunms.BaseColumnVertices.Length; num++)
{
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num].pos +
colunms.BaseColumnVertices[num].normal * 10,
Color.Red);
BaseGame.DrawLine(
colunms.BaseColumnVertices[num].pos,
colunms.BaseColumnVertices[num].pos +
colunms.BaseColumnVertices[num].tangent * 10,
Color.Blue);
} // for (num)
});
}
/// <summary>
/// Generate vertices and objects
/// </summary>
private void GenerateVerticesAndObjects(Landscape landscape)
{
#region Generate the road vertices
// Each road segment gets 5 points:
// left, left middle, middle, right middle, right.
// The reason for this is that we would bad triangle errors if the
// road gets wider and wider. This happens because we need to render
// quad, but we can only render triangles, which often have different
// orientations, which makes the road very bumpy. This still happens
// with 8 polygons instead of 2, but it is much better this way.
// Another trick is not to do so much iterations in TrackLine, which
// causes this problem. Better to have a not so round track, but at
// least the road up/down itself is smooth.
// The last point is duplicated (see TrackLine) because we have 2 sets
// of texture coordinates for it (begin block, end block).
// So for the index buffer we only use points.Count-1 blocks.
roadVertices = new TangentVertex[points.Count * 5];
// Current texture coordinate for the roadway (in direction of movement)
for (int num = 0; num < points.Count; num++)
{
// Get vertices with help of the properties in the TrackVertex class.
// For the road itself we only need vertices for the left and right
// side, which are vertex number 0 and 1.
roadVertices[num * 5 + 0] = points[num].RightTangentVertex;
roadVertices[num * 5 + 1] = points[num].MiddleRightTangentVertex;
roadVertices[num * 5 + 2] = points[num].MiddleTangentVertex;
roadVertices[num * 5 + 3] = points[num].MiddleLeftTangentVertex;
roadVertices[num * 5 + 4] = points[num].LeftTangentVertex;
} // for (num)
roadVb = new VertexBuffer(
BaseGame.Device,
typeof(TangentVertex),
roadVertices.Length,
ResourceUsage.WriteOnly,
ResourceManagementMode.Automatic);
roadVb.SetData(roadVertices);
// Also calculate all indices, we have 8 polygons for each segment with
// 3 vertices each. We got 1 segment less than points because the
// last point is duplicated (different tex coords).
int[] indices = new int[(points.Count - 1) * 8 * 3];
int vertexIndex = 0;
for (int num = 0; num < points.Count - 1; num++)
{
// We only use 3 vertices (and the next 3 vertices),
// but we have to construct all 24 indices for our 4 polygons.
for (int sideNum = 0; sideNum < 4; sideNum++)
{
// Each side needs 2 polygons.
// 1. Polygon
indices[num * 24 + 6 * sideNum + 0] =
vertexIndex + sideNum;
indices[num * 24 + 6 * sideNum + 1] =
vertexIndex + 5 + 1 + sideNum;
indices[num * 24 + 6 * sideNum + 2] =
vertexIndex + 5 + sideNum;
// 2. Polygon
indices[num * 24 + 6 * sideNum + 3] =
vertexIndex + 5 + 1 + sideNum;
indices[num * 24 + 6 * sideNum + 4] =
vertexIndex + sideNum;
indices[num * 24 + 6 * sideNum + 5] =
vertexIndex + 1 + sideNum;
} // for (num)
// Go to the next 5 vertices
vertexIndex += 5;
} // for (num)
// Set road back index buffer
roadIb = new IndexBuffer(
BaseGame.Device,
typeof(int),
indices.Length,
ResourceUsage.WriteOnly,
ResourceManagementMode.Automatic);
roadIb.SetData(indices);
#endregion
#region Generate the road back vertices
// We need 4 vertices per cross-section edge of the road back hull
roadBackVertices = new TangentVertex[points.Count * 4];
for (int num = 0; num < points.Count; num++)
{
// Left side of the road
roadBackVertices[num * 4 + 0] =
points[num].LeftTangentVertex;
roadBackVertices[num * 4 + 0].uv = new Vector2(
roadBackVertices[num * 4 + 0].U * RoadBackHullTextureWidthFactor,
0.0f);
// Left lower side of the road
roadBackVertices[num * 4 + 1] =
points[num].BottomLeftSideTangentVertex;
roadBackVertices[num * 4 + 1].uv = new Vector2(
roadBackVertices[num * 4 + 0].U * RoadBackHullTextureWidthFactor,
RoadBackSideTextureHeight);
// Right lower side of the road
roadBackVertices[num * 4 + 2] =
points[num].BottomRightSideTangentVertex;
roadBackVertices[num * 4 + 2].uv = new Vector2(
roadBackVertices[num * 4 + 0].U * RoadBackHullTextureWidthFactor,
1.0f - RoadBackSideTextureHeight);
// Right side of the road
roadBackVertices[num * 4 + 3] =
points[num].RightTangentVertex;
roadBackVertices[num * 4 + 3].uv = new Vector2(
roadBackVertices[num * 4 + 3].U * RoadBackHullTextureWidthFactor,
1.0f);
} // for (num)
// Set road back vertex buffer
roadBackVb = new VertexBuffer(
BaseGame.Device,
typeof(TangentVertex),
roadBackVertices.Length,
ResourceUsage.WriteOnly,
ResourceManagementMode.Automatic);
roadBackVb.SetData(roadBackVertices);
// Also calculate all indices, we have 6 polygons for each segment with
// 3 vertices each. We got 1 segment less than points because the
// last point is duplicated (different tex coords).
int[] backIndices = new int[(points.Count-1) * 6 * 3];
vertexIndex = 0;
for (int num = 0; num < points.Count-1; num++)
{
// We only use 4 vertices (and the next 4 vertices),
// but we have to construct all 18 indices for our 6 polygons.
for (int sideNum = 0; sideNum < 3; sideNum++)
{
// Each side needs 2 polygons.
// 1. Polygon
backIndices[num * 18 + 6 * sideNum + 0] =
vertexIndex + sideNum;
backIndices[num * 18 + 6 * sideNum + 1] =
vertexIndex + 5 + sideNum;
backIndices[num * 18 + 6 * sideNum + 2] =
vertexIndex + 4 + sideNum;
// 2. Polygon
backIndices[num * 18 + 6 * sideNum + 3] =
vertexIndex + 5 + sideNum;
backIndices[num * 18 + 6 * sideNum + 4] =
vertexIndex + sideNum;
backIndices[num * 18 + 6 * sideNum + 5] =
vertexIndex + 1 + sideNum;
} // for (num)
// Go to the next 4 vertices
vertexIndex += 4;
} // for (num)
// Set road back index buffer
roadBackIb = new IndexBuffer(
BaseGame.Device,
typeof(int),
backIndices.Length,
ResourceUsage.WriteOnly,
ResourceManagementMode.Automatic);
roadBackIb.SetData(backIndices);
#endregion
#region Generate guard rails
leftRail = new GuardRail(points, GuardRail.Modes.Left, landscape);
rightRail = new GuardRail(points, GuardRail.Modes.Right, landscape);
#endregion
#region Generate columns
columns = new TrackColumns(points, landscape);
#endregion
GenerateObjectsForTrack(landscape);
}
