public void SubDivideNoNormalize(List <Triangle> triList, List <PositionTexture> vertexList)
{
Vector3d a1 = Vector3d.Lerp(vertexList[B].Position, vertexList[C].Position, .5f);
Vector3d b1 = Vector3d.Lerp(vertexList[C].Position, vertexList[A].Position, .5f);
Vector3d c1 = Vector3d.Lerp(vertexList[A].Position, vertexList[B].Position, .5f);
Vector2d a1uv = Vector2d.Lerp(Vector2d.Create(vertexList[B].Tu, vertexList[B].Tv), Vector2d.Create(vertexList[C].Tu, vertexList[C].Tv), .5f);
Vector2d b1uv = Vector2d.Lerp(Vector2d.Create(vertexList[C].Tu, vertexList[C].Tv), Vector2d.Create(vertexList[A].Tu, vertexList[A].Tv), .5f);
Vector2d c1uv = Vector2d.Lerp(Vector2d.Create(vertexList[A].Tu, vertexList[A].Tv), Vector2d.Create(vertexList[B].Tu, vertexList[B].Tv), .5f);
//a1.Normalize();
//b1.Normalize();
//c1.Normalize();
int aIndex = vertexList.Count;
int bIndex = vertexList.Count + 1;
int cIndex = vertexList.Count + 2;
vertexList.Add(PositionTexture.CreatePosRaw(a1, a1uv.X, a1uv.Y));
vertexList.Add(PositionTexture.CreatePosRaw(b1, b1uv.X, b1uv.Y));
vertexList.Add(PositionTexture.CreatePosRaw(c1, c1uv.X, c1uv.Y));
triList.Add(Triangle.Create(A, cIndex, bIndex));
triList.Add(Triangle.Create(B, aIndex, cIndex));
triList.Add(Triangle.Create(C, bIndex, aIndex));
triList.Add(Triangle.Create(aIndex, bIndex, cIndex));
}
private static void CreateGalaxyImage(RenderContext renderContext)
{
if (milkyWayImage == null)
{
milkyWayImage = Planets.LoadPlanetTexture("http://cdn.worldwidetelescope.org/webclient/images/milkywaybar.jpg");
}
int subdivs = 50;
double lat, lng;
int index = 0;
double latMin = 64;
double latMax = -64;
double lngMin = -64;
double lngMax = 64;
//// Create a vertex buffer
galaxyImageVertexBuffer = new PositionTextureVertexBuffer((subdivs + 1) * (subdivs + 1));
PositionTexture[] verts = (PositionTexture[])galaxyImageVertexBuffer.Lock();
int x1, y1;
double latDegrees = latMax - latMin;
double lngDegrees = lngMax - lngMin;
double scaleFactor = 60800000.0;
double ecliptic = Coordinates.MeanObliquityOfEcliptic(SpaceTimeController.JNow) / 180.0 * Math.PI;
Vector3d point;
double textureStepX = 1.0f / subdivs;
double textureStepY = 1.0f / subdivs;
for (y1 = 0; y1 <= subdivs; y1++)
{
if (y1 != subdivs)
{
lat = latMax - (textureStepY * latDegrees * (double)y1);
}
else
{
lat = latMin;
}
for (x1 = 0; x1 <= subdivs; x1++)
{
if (x1 != subdivs)
{
lng = lngMin + (textureStepX * lngDegrees * (double)x1);
}
else
{
lng = lngMax;
}
index = y1 * (subdivs + 1) + x1;
point = Vector3d.Create(lng * scaleFactor, 0, (lat - 28) * scaleFactor);
point.RotateY(213.0 / 180 * Math.PI);
point.RotateZ((-62.87175) / 180 * Math.PI);
point.RotateY((-192.8595083) / 180 * Math.PI);
point.RotateX(ecliptic);
verts[index] = PositionTexture.CreatePosRaw(point, (float)(1f - x1 * textureStepX), (float)(/*1f - */ (y1 * textureStepY)));
//verts[index].Position = point;
//verts[index].Tu = (float)(1f - x1 * textureStepX);
//verts[index].Tv = (float)(/*1f - */(y1 * textureStepY));
}
}
galaxyImageVertexBuffer.Unlock();
galaxyImageTriangleCount = (subdivs) * (subdivs) * 2;
Uint16Array ui16array = new Uint16Array(subdivs * subdivs * 6);
UInt16[] indexArray = (UInt16[])(object)ui16array;
for (y1 = 0; y1 < subdivs; y1++)
{
for (x1 = 0; x1 < subdivs; x1++)
{
index = (y1 * subdivs * 6) + 6 * x1;
// First triangle in quad
indexArray[index] = (ushort)(y1 * (subdivs + 1) + x1);
indexArray[index + 2] = (ushort)((y1 + 1) * (subdivs + 1) + x1);
indexArray[index + 1] = (ushort)(y1 * (subdivs + 1) + (x1 + 1));
// Second triangle in quad
indexArray[index + 3] = (ushort)(y1 * (subdivs + 1) + (x1 + 1));
indexArray[index + 5] = (ushort)((y1 + 1) * (subdivs + 1) + x1);
indexArray[index + 4] = (ushort)((y1 + 1) * (subdivs + 1) + (x1 + 1));
}
}
galaxyImageIndexBuffer = Tile.PrepDevice.createBuffer();
Tile.PrepDevice.bindBuffer(GL.ELEMENT_ARRAY_BUFFER, galaxyImageIndexBuffer);
Tile.PrepDevice.bufferData(GL.ELEMENT_ARRAY_BUFFER, ui16array, GL.STATIC_DRAW);
}