internal void AddSphereRing(BoundingSphere sphere, Color color, Matrix onb)
{
float increment = 1.0f / 32;
for (float i = 0; i < 1; i += increment)
{
float a0 = 2 * (float)Math.PI * i;
float a1 = 2 * (float)Math.PI * (i + increment);
Add(
Vector3.Transform(new Vector3(Math.Cos(a0), 0, Math.Sin(a0)) * sphere.Radius, onb) + sphere.Center,
Vector3.Transform(new Vector3(Math.Cos(a1), 0, Math.Sin(a1)) * sphere.Radius, onb) + sphere.Center,
color);
}
}
internal void AddCone(Vector3 translation, Vector3 directionVec, Vector3 baseVec, int tessalation, Color color)
{
var axis = directionVec;
axis.Normalize();
var apex = translation + directionVec;
var steps = tessalation;
var stepsRcp = (float)(Math.PI * 2 / steps);
for (int i = 0; i < 32; i++)
{
float a0 = i * stepsRcp;
float a1 = (i + 1) * stepsRcp;
var A = translation + Vector3.Transform(baseVec, Matrix.CreateFromAxisAngle(axis, a0));
var B = translation + Vector3.Transform(baseVec, Matrix.CreateFromAxisAngle(axis, a1));
Add(A, B, color);
Add(A, apex, color);
}
}
// Special method that loads data into GPU, and can be called only from Draw method, never from LoadContent or from background thread.
// Because that would lead to empty vertex/index buffers if they are filled/created while game is minimized (remember the issue - alt-tab during loading screen)
static void LoadInDraw()
{
if (m_backgroundOrientationDirty)
{
Static.UnloadContent();
}
if (m_loaded)
{
return;
}
// In fact it doesn't matter how large is cube, it will always look same as we are always in its middle
// I changed it from 1.0 to 100.0 only because will small length I had problems with near frustum plane and crazy aspect ratios.
const float CUBE_LENGTH_HALF = 100;
Vector3 shapeSize = Vector3.One * CUBE_LENGTH_HALF;
Vector3 shapePosition = Vector3.Zero;
MyVertexFormatPositionTexture3[] boxVertices = new MyVertexFormatPositionTexture3[36];
Vector3 topLeftFront = shapePosition + new Vector3(-1.0f, 1.0f, -1.0f) * shapeSize;
Vector3 bottomLeftFront = shapePosition + new Vector3(-1.0f, -1.0f, -1.0f) * shapeSize;
Vector3 topRightFront = shapePosition + new Vector3(1.0f, 1.0f, -1.0f) * shapeSize;
Vector3 bottomRightFront = shapePosition + new Vector3(1.0f, -1.0f, -1.0f) * shapeSize;
Vector3 topLeftBack = shapePosition + new Vector3(-1.0f, 1.0f, 1.0f) * shapeSize;
Vector3 topRightBack = shapePosition + new Vector3(1.0f, 1.0f, 1.0f) * shapeSize;
Vector3 bottomLeftBack = shapePosition + new Vector3(-1.0f, -1.0f, 1.0f) * shapeSize;
Vector3 bottomRightBack = shapePosition + new Vector3(1.0f, -1.0f, 1.0f) * shapeSize;
Vector3 textureTopLeftFront = MyUtils.Normalize(topLeftFront);
Vector3 textureBottomLeftFront = MyUtils.Normalize(bottomLeftFront);
Vector3 textureTopRightFront = MyUtils.Normalize(topRightFront);
Vector3 textureBottomRightFront = MyUtils.Normalize(bottomRightFront);
Vector3 textureTopLeftBack = MyUtils.Normalize(topLeftBack);
Vector3 textureTopRightBack = MyUtils.Normalize(topRightBack);
Vector3 textureBottomLeftBack = MyUtils.Normalize(bottomLeftBack);
Vector3 textureBottomRightBack = MyUtils.Normalize(bottomRightBack);
textureTopLeftFront.Z *= -1;
textureBottomLeftFront.Z *= -1;
textureTopRightFront.Z *= -1;
textureBottomRightFront.Z *= -1;
textureTopLeftBack.Z *= -1;
textureTopRightBack.Z *= -1;
textureBottomLeftBack.Z *= -1;
textureBottomRightBack.Z *= -1;
// Front face.
boxVertices[0] = new MyVertexFormatPositionTexture3(topLeftFront, textureTopLeftFront);
boxVertices[1] = new MyVertexFormatPositionTexture3(bottomLeftFront, textureBottomLeftFront);
boxVertices[2] = new MyVertexFormatPositionTexture3(topRightFront, textureTopRightFront);
boxVertices[3] = new MyVertexFormatPositionTexture3(bottomLeftFront, textureBottomLeftFront);
boxVertices[4] = new MyVertexFormatPositionTexture3(bottomRightFront, textureBottomRightFront);
boxVertices[5] = new MyVertexFormatPositionTexture3(topRightFront, textureTopRightFront);
// Back face.
boxVertices[6] = new MyVertexFormatPositionTexture3(topLeftBack, textureTopLeftBack);
boxVertices[7] = new MyVertexFormatPositionTexture3(topRightBack, textureTopRightBack);
boxVertices[8] = new MyVertexFormatPositionTexture3(bottomLeftBack, textureBottomLeftBack);
boxVertices[9] = new MyVertexFormatPositionTexture3(bottomLeftBack, textureBottomLeftBack);
boxVertices[10] = new MyVertexFormatPositionTexture3(topRightBack, textureTopRightBack);
boxVertices[11] = new MyVertexFormatPositionTexture3(bottomRightBack, textureBottomRightBack);
// Top face.
boxVertices[12] = new MyVertexFormatPositionTexture3(topLeftFront, textureTopLeftFront);
boxVertices[13] = new MyVertexFormatPositionTexture3(topRightBack, textureTopRightBack);
boxVertices[14] = new MyVertexFormatPositionTexture3(topLeftBack, textureTopLeftBack);
boxVertices[15] = new MyVertexFormatPositionTexture3(topLeftFront, textureTopLeftFront);
boxVertices[16] = new MyVertexFormatPositionTexture3(topRightFront, textureTopRightFront);
boxVertices[17] = new MyVertexFormatPositionTexture3(topRightBack, textureTopRightBack);
// Bottom face.
boxVertices[18] = new MyVertexFormatPositionTexture3(bottomLeftFront, textureBottomLeftFront);
boxVertices[19] = new MyVertexFormatPositionTexture3(bottomLeftBack, textureBottomLeftBack);
boxVertices[20] = new MyVertexFormatPositionTexture3(bottomRightBack, textureBottomRightBack);
boxVertices[21] = new MyVertexFormatPositionTexture3(bottomLeftFront, textureBottomLeftFront);
boxVertices[22] = new MyVertexFormatPositionTexture3(bottomRightBack, textureBottomRightBack);
boxVertices[23] = new MyVertexFormatPositionTexture3(bottomRightFront, textureBottomRightFront);
// Left face.
boxVertices[24] = new MyVertexFormatPositionTexture3(topLeftFront, textureTopLeftFront);
boxVertices[25] = new MyVertexFormatPositionTexture3(bottomLeftBack, textureBottomLeftBack);
boxVertices[26] = new MyVertexFormatPositionTexture3(bottomLeftFront, textureBottomLeftFront);
boxVertices[27] = new MyVertexFormatPositionTexture3(topLeftBack, textureTopLeftBack);
boxVertices[28] = new MyVertexFormatPositionTexture3(bottomLeftBack, textureBottomLeftBack);
boxVertices[29] = new MyVertexFormatPositionTexture3(topLeftFront, textureTopLeftFront);
// Right face.
boxVertices[30] = new MyVertexFormatPositionTexture3(topRightFront, textureTopRightFront);
boxVertices[31] = new MyVertexFormatPositionTexture3(bottomRightFront, textureBottomRightFront);
boxVertices[32] = new MyVertexFormatPositionTexture3(bottomRightBack, textureBottomRightBack);
boxVertices[33] = new MyVertexFormatPositionTexture3(topRightBack, textureTopRightBack);
boxVertices[34] = new MyVertexFormatPositionTexture3(topRightFront, textureTopRightFront);
boxVertices[35] = new MyVertexFormatPositionTexture3(bottomRightBack, textureBottomRightBack);
// if we've loaded the cube from DDS, orient it towards the sun
for (int i = 0; i < boxVertices.Length; i++)
{
boxVertices[i].Position = Vector3.Transform(boxVertices[i].Position, m_backgroundOrientation);
}
m_boxVertexBuffer = new VertexBuffer(MyRender.GraphicsDevice, MyVertexFormatPositionTexture3.Stride * boxVertices.Length, Usage.WriteOnly, VertexFormat.None, Pool.Default);
m_boxVertexBuffer.SetData(boxVertices);
m_boxVertexBuffer.DebugName = "BackgroundCube";
UpdateTexture();
m_backgroundOrientationDirty = false;
m_loaded = true;
}