public static Mesh CreateWireTriangularPrism(Vector3 baseCenter, float baseWidth, float baseDepth, float topWidth, float topDepth, float height, Color color)
{
baseWidth = Mathf.Max(Mathf.Abs(baseWidth), 1e-4f);
baseDepth = Mathf.Max(Mathf.Abs(baseDepth), 1e-4f);
topWidth = Mathf.Max(Mathf.Abs(topWidth), 1e-4f);
topDepth = Mathf.Max(Mathf.Abs(topDepth), 1e-4f);
height = Mathf.Max(Mathf.Abs(height), 1e-4f);
List <Vector3> cornerPoints = PrismMath.CalcTriangPrismCornerPoints(baseCenter, baseWidth, baseDepth, topWidth, topDepth, height, Quaternion.identity);
Vector3 baseLeftPt = cornerPoints[(int)TriangularPrismCorner.BaseLeft];
Vector3 baseRightPt = cornerPoints[(int)TriangularPrismCorner.BaseRight];
Vector3 baseForwardPt = cornerPoints[(int)TriangularPrismCorner.BaseForward];
Vector3 topLeftPt = cornerPoints[(int)TriangularPrismCorner.TopLeft];
Vector3 topRightPt = cornerPoints[(int)TriangularPrismCorner.TopRight];
Vector3 topForwardPt = cornerPoints[(int)TriangularPrismCorner.TopForward];
Vector3[] positions = new Vector3[]
{
baseLeftPt, baseForwardPt, baseRightPt,
topLeftPt, topForwardPt, topRightPt
};
int[] indices = new int[] { 0, 1, 1, 2, 2, 0, 3, 4, 4, 5, 5, 3, 0, 3, 1, 4, 2, 5 };
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(positions.Length, color);
mesh.SetIndices(indices, MeshTopology.Lines, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateWirePyramid(Vector3 baseCenter, float baseWidth, float baseDepth, float height, Color color)
{
baseWidth = Mathf.Max(Mathf.Abs(baseWidth), 1e-4f);
baseDepth = Mathf.Max(Mathf.Abs(baseDepth), 1e-4f);
height = Mathf.Max(Mathf.Abs(height), 1e-4f);
float halfBaseWidth = baseWidth * 0.5f;
float halfBaseDepth = baseDepth * 0.5f;
Vector3[] positions = new Vector3[]
{
baseCenter - Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
baseCenter - Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
baseCenter + Vector3.up * height
};
int[] indices = new int[] { 0, 1, 1, 2, 2, 3, 3, 0, 0, 4, 1, 4, 2, 4, 3, 4 };
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(positions.Length, color);
mesh.SetIndices(indices, MeshTopology.Lines, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateWireCircleXY(float circleRadius, int numBorderPoints, Color color)
{
if (circleRadius < 1e-4f || numBorderPoints < 4)
{
return(null);
}
Vector3[] positions = new Vector3[numBorderPoints];
int[] indices = new int[numBorderPoints];
float angleStep = 360.0f / (numBorderPoints - 1);
for (int ptIndex = 0; ptIndex < numBorderPoints; ++ptIndex)
{
float angle = angleStep * ptIndex * Mathf.Deg2Rad;
positions[ptIndex] = new Vector3(Mathf.Sin(angle) * circleRadius, Mathf.Cos(angle) * circleRadius, 0.0f);
indices[ptIndex] = ptIndex;
}
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(numBorderPoints, color);
mesh.SetIndices(indices, MeshTopology.LineStrip, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateCoordSystemAxesLines(float axisLength, Color color)
{
if (axisLength < 1e-4f)
{
return(null);
}
Vector3[] positions = new Vector3[]
{
Vector3.zero,
Vector3.right *axisLength,
Vector3.up *axisLength,
Vector3.forward *axisLength
};
int[] indices = new int[]
{
0, 1,
0, 2,
0, 3
};
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(4, color);
mesh.SetIndices(indices, MeshTopology.Lines, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateWireQuadXY(Vector3 center, Vector2 size, Color color)
{
Vector2 halfSize = size * 0.5f;
Vector3[] positions = new Vector3[]
{
center - Vector3.right * halfSize.x - Vector3.up * halfSize.y,
center - Vector3.right * halfSize.x + Vector3.up * halfSize.y,
center + Vector3.right * halfSize.x + Vector3.up * halfSize.y,
center + Vector3.right * halfSize.x - Vector3.up * halfSize.y
};
int[] indices = new int[]
{
0, 1, 1, 2, 2, 3, 3, 0
};
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(4, color);
mesh.SetIndices(indices, MeshTopology.Lines, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateLine(Vector3 startPoint, Vector3 endPoint, Color color)
{
Mesh mesh = new Mesh();
mesh.vertices = new Vector3[] { startPoint, endPoint };
mesh.colors = ColorEx.GetFilledColorArray(2, color);
mesh.SetIndices(new int[] { 0, 1 }, MeshTopology.Lines, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateCircleXY(float circleRadius, int numBorderPoints, Color color)
{
if (circleRadius < 1e-4f || numBorderPoints < 4)
{
return(null);
}
int numVerts = numBorderPoints + 1;
int numTriangles = numBorderPoints - 1;
Vector3[] positions = new Vector3[numBorderPoints + 1];
Vector3[] normals = new Vector3[positions.Length];
int[] indices = new int[numTriangles * 3];
int indexPtr = 0;
positions[0] = Vector3.zero;
float angleStep = 360.0f / (numBorderPoints - 1);
for (int ptIndex = 0; ptIndex < numBorderPoints; ++ptIndex)
{
float angle = angleStep * ptIndex * Mathf.Deg2Rad;
int vertIndex = ptIndex + 1;
positions[vertIndex] = new Vector3(Mathf.Sin(angle) * circleRadius, Mathf.Cos(angle) * circleRadius, 0.0f);
normals[vertIndex] = Vector3.forward;
}
for (int vertIndex = 1; vertIndex < numVerts - 1; ++vertIndex)
{
indices[indexPtr++] = 0;
indices[indexPtr++] = vertIndex;
indices[indexPtr++] = vertIndex + 1;
}
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(positions.Length, color);
mesh.normals = normals;
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateQuadXZ(float width, float depth, Color color)
{
if (width < 1e-4f)
{
return(null);
}
if (depth < 1e-4f)
{
return(null);
}
float halfWidth = width * 0.5f;
float halfDepth = depth * 0.5f;
Vector3[] positions = new Vector3[]
{
-Vector3.right * halfWidth - Vector3.forward * halfDepth,
-Vector3.right * halfWidth + Vector3.forward * halfDepth,
Vector3.right *halfWidth + Vector3.forward * halfDepth,
Vector3.right *halfWidth - Vector3.forward * halfDepth
};
Vector3[] normals = new Vector3[]
{
Vector3.up, Vector3.up, Vector3.up, Vector3.up
};
Vector2[] uvs = new Vector2[]
{
Vector2.zero, new Vector2(0.0f, 1.0f), new Vector2(1.0f, 1.0f), new Vector2(1.0f, 0.0f)
};
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.normals = normals;
mesh.uv = uvs;
mesh.colors = ColorEx.GetFilledColorArray(4, color);
mesh.SetIndices(new int[] { 0, 1, 2, 2, 3, 0 }, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreatePyramid(Vector3 baseCenter, float baseWidth, float baseDepth, float height, Color color)
{
baseWidth = Mathf.Max(Mathf.Abs(baseWidth), 1e-4f);
baseDepth = Mathf.Max(Mathf.Abs(baseDepth), 1e-4f);
height = Mathf.Max(Mathf.Abs(height), 1e-4f);
float halfBaseWidth = baseWidth * 0.5f;
float halfBaseDepth = baseDepth * 0.5f;
Vector3 tipPosition = baseCenter + Vector3.up * height;
Vector3[] positions = new Vector3[]
{
// Front face
tipPosition,
baseCenter + Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter - Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
// Right face
tipPosition,
baseCenter + Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
// Back face
tipPosition,
baseCenter - Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
// Left face
tipPosition,
baseCenter - Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter - Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
// Bottom face
baseCenter - Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth - Vector3.forward * halfBaseDepth,
baseCenter + Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth,
baseCenter - Vector3.right * halfBaseWidth + Vector3.forward * halfBaseDepth
};
int[] indices = new int[]
{
0, 1, 2,
3, 4, 5,
6, 7, 8,
9, 10, 11,
12, 13, 14,
12, 14, 15
};
Vector3[] normals = new Vector3[positions.Length];
for (int triangleIndex = 0; triangleIndex < 4; ++triangleIndex)
{
int index0 = indices[triangleIndex * 3];
int index1 = indices[triangleIndex * 3 + 1];
int index2 = indices[triangleIndex * 3 + 2];
Vector3 edge0 = positions[index1] - positions[index0];
Vector3 edge1 = positions[index2] - positions[index0];
Vector3 normal = Vector3.Cross(edge0, edge1).normalized;
normals[index0] = normal;
normals[index1] = normal;
normals[index2] = normal;
}
normals[normals.Length - 4] = -Vector3.up;
normals[normals.Length - 3] = -Vector3.up;
normals[normals.Length - 2] = -Vector3.up;
normals[normals.Length - 1] = -Vector3.up;
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(positions.Length, color);
mesh.normals = normals;
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateCylinder(float bottomRadius, float topRadius, float height, int numSlices,
int numStacks, int numBottomCapRings, int numTopCapRings, Color color)
{
const float minSize = 1e-4f;
if (bottomRadius < minSize)
{
bottomRadius = minSize;
}
if (topRadius < minSize)
{
topRadius = minSize;
}
if (height < minSize)
{
height = minSize;
}
const int minNumSlices = 3;
if (numSlices < minNumSlices)
{
numSlices = minNumSlices;
}
const int minNumStacks = 1;
if (numStacks < minNumStacks)
{
numStacks = minNumStacks;
}
int minNumCapRings = 1;
bool generateBottomCap = numBottomCapRings >= minNumCapRings;
bool generateTopCap = numTopCapRings >= minNumCapRings;
int numAxialRows = numStacks + 1;
int numVertsPerRow = numSlices + 1;
int numAxialVertices = numAxialRows * numVertsPerRow;
int totalNumVerts = numAxialVertices;
Vector3[] axialPositions = new Vector3[numAxialVertices];
Vector3[] axialNormals = new Vector3[numAxialVertices];
List <Vector3> allPositions = new List <Vector3>(numAxialVertices);
List <Vector3> allNormals = new List <Vector3>(numAxialVertices);
// Generate the axial vertices
int vertexPtr = 0;
Vector3 basePosition = Vector3.zero;
Vector3 topPosition = Vector3.up * height;
Vector3 cylinderUp = Vector3.up;
float yPosStep = height / numStacks;
float angleStep = 360.0f / numSlices;
for (int axialRowIndex = 0; axialRowIndex < numAxialRows; ++axialRowIndex)
{
float rowYPos = basePosition.y + axialRowIndex * yPosStep;
float radius = Mathf.Lerp(bottomRadius, topRadius, rowYPos / topPosition.y);
for (int vIndex = 0; vIndex < numVertsPerRow; ++vIndex)
{
float angle = vIndex * angleStep;
Vector3 normal = (new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), 0.0f, Mathf.Sin(angle * Mathf.Deg2Rad))).normalized;
axialNormals[vertexPtr] = normal;
axialPositions[vertexPtr] = basePosition + rowYPos * cylinderUp + normal * radius;
++vertexPtr;
}
}
allPositions.AddRange(axialPositions);
allNormals.AddRange(axialNormals);
// Generate the axial vertex indices
int indexPtr = 0;
List <int> allIndices = new List <int>(100);
int numAxialIndices = numSlices * numStacks * 6;
int[] axialIndices = new int[numAxialIndices];
for (int axialRowIndex = 0; axialRowIndex < numAxialRows - 1; ++axialRowIndex)
{
for (int vIndex = 0; vIndex < numVertsPerRow - 1; ++vIndex)
{
int indexOffset = axialRowIndex * numVertsPerRow + vIndex;
// First triangle
axialIndices[indexPtr++] = indexOffset;
axialIndices[indexPtr++] = indexOffset + numVertsPerRow;
axialIndices[indexPtr++] = indexOffset + 1;
// Second triangle
axialIndices[indexPtr++] = indexOffset + numVertsPerRow;
axialIndices[indexPtr++] = indexOffset + numVertsPerRow + 1;
axialIndices[indexPtr++] = indexOffset + 1;
}
}
allIndices.AddRange(axialIndices);
// Generate bottom cap if necessary
if (generateBottomCap)
{
int numVertRings = numBottomCapRings + 1;
int numVertsPerRing = numSlices + 1;
int numCapVerts = numVertRings * numVertsPerRing;
totalNumVerts += numCapVerts;
vertexPtr = 0;
Vector3[] capPositions = new Vector3[numCapVerts];
Vector3[] capNormals = new Vector3[numCapVerts];
for (int ringIndex = 0; ringIndex < numVertRings; ++ringIndex)
{
float radius = Mathf.Lerp(bottomRadius, 0.0f, ringIndex / (float)(numVertRings - 1));
for (int vIndex = 0; vIndex < numVertsPerRing; ++vIndex)
{
float angle = vIndex * angleStep;
Vector3 positionDir = (new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), 0.0f, Mathf.Sin(angle * Mathf.Deg2Rad))).normalized;
capPositions[vertexPtr] = basePosition + positionDir * radius;
capNormals[vertexPtr] = -cylinderUp;
++vertexPtr;
}
}
int baseVertexIndex = allPositions.Count;
allPositions.AddRange(capPositions);
allNormals.AddRange(capNormals);
indexPtr = 0;
int numCapIndices = numSlices * numBottomCapRings * 6;
int[] capIndices = new int[numCapIndices];
for (int vertexRingIndex = 0; vertexRingIndex < numVertRings - 1; ++vertexRingIndex)
{
for (int vIndex = 0; vIndex < numVertsPerRing - 1; ++vIndex)
{
int indexOffset = baseVertexIndex + vertexRingIndex * numVertsPerRing + vIndex;
// First triangle
capIndices[indexPtr++] = indexOffset;
capIndices[indexPtr++] = indexOffset + 1;
capIndices[indexPtr++] = indexOffset + numVertsPerRing;
// Second triangle
capIndices[indexPtr++] = indexOffset + numVertsPerRing;
capIndices[indexPtr++] = indexOffset + 1;
capIndices[indexPtr++] = indexOffset + numVertsPerRing + 1;
}
}
allIndices.AddRange(capIndices);
}
// Generate top cap if necessary
if (generateTopCap)
{
int numVertRings = numTopCapRings + 1;
int numVertsPerRing = numSlices + 1;
int numCapVerts = numVertRings * numVertsPerRing;
totalNumVerts += numCapVerts;
vertexPtr = 0;
Vector3[] capPositions = new Vector3[numCapVerts];
Vector3[] capNormals = new Vector3[numCapVerts];
for (int ringIndex = 0; ringIndex < numVertRings; ++ringIndex)
{
float radius = Mathf.Lerp(topRadius, 0.0f, ringIndex / (float)(numVertRings - 1));
for (int vIndex = 0; vIndex < numVertsPerRing; ++vIndex)
{
float angle = vIndex * angleStep;
Vector3 positionDir = (new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), 0.0f, Mathf.Sin(angle * Mathf.Deg2Rad))).normalized;
capPositions[vertexPtr] = topPosition + positionDir * radius;
capNormals[vertexPtr] = cylinderUp;
++vertexPtr;
}
}
int baseVertexIndex = allPositions.Count;
allPositions.AddRange(capPositions);
allNormals.AddRange(capNormals);
indexPtr = 0;
int numCapIndices = numSlices * numTopCapRings * 6;
int[] capIndices = new int[numCapIndices];
for (int vertexRingIndex = 0; vertexRingIndex < numVertRings - 1; ++vertexRingIndex)
{
for (int vIndex = 0; vIndex < numVertsPerRing - 1; ++vIndex)
{
int indexOffset = baseVertexIndex + vertexRingIndex * numVertsPerRing + vIndex;
// First triangle
capIndices[indexPtr++] = indexOffset;
capIndices[indexPtr++] = indexOffset + numVertsPerRing;
capIndices[indexPtr++] = indexOffset + 1;
// Second triangle
capIndices[indexPtr++] = indexOffset + numVertsPerRing;
capIndices[indexPtr++] = indexOffset + numVertsPerRing + 1;
capIndices[indexPtr++] = indexOffset + 1;
}
}
allIndices.AddRange(capIndices);
}
Mesh mesh = new Mesh();
mesh.vertices = allPositions.ToArray();
mesh.normals = allNormals.ToArray();
mesh.colors = ColorEx.GetFilledColorArray(totalNumVerts, color);
mesh.SetIndices(allIndices.ToArray(), MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateSphere(float radius, int numSlices, int numStacks, Color color)
{
if (radius < 1e-4f || numSlices < 3 || numStacks < 2)
{
return(null);
}
int numVertRows = numStacks + 1;
int numVertsPerRow = numSlices + 1;
int numVerts = numVertRows * numVertsPerRow;
Vector3[] positions = new Vector3[numVerts];
Vector3[] normals = new Vector3[numVerts];
int vertexPtr = 0;
float angleStep = 360.0f / (numVertsPerRow - 1);
for (int vertRowIndex = 0; vertRowIndex < numVertRows; ++vertRowIndex)
{
float theta = Mathf.PI * (float)vertRowIndex / (numVertRows - 1);
float cosTheta = Mathf.Cos(theta);
float sinTheta = Mathf.Sin(theta);
for (int vertIndex = 0; vertIndex < numVertsPerRow; ++vertIndex)
{
float centralAxisRotAngle = angleStep * vertIndex * Mathf.Deg2Rad;
Vector3 rotatedAxis = Vector3.right * Mathf.Sin(centralAxisRotAngle) +
Vector3.forward * Mathf.Cos(centralAxisRotAngle);
positions[vertexPtr] = rotatedAxis * sinTheta * radius + Vector3.up * cosTheta * radius;
normals[vertexPtr] = Vector3.Normalize(positions[vertexPtr]);
++vertexPtr;
}
}
int indexPtr = 0;
int numIndices = numSlices * numStacks * 6;
int[] indices = new int[numIndices];
for (int vertRowIndex = 0; vertRowIndex < numVertRows - 1; ++vertRowIndex)
{
for (int vertIndex = 0; vertIndex < numVertsPerRow - 1; ++vertIndex)
{
// Calculate the index of the first vertex inside the first triangle
int baseIndex = vertRowIndex * numVertsPerRow + vertIndex;
// First triangle
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + numVertsPerRow;
indices[indexPtr++] = baseIndex + numVertsPerRow + 1;
// Second triangle
indices[indexPtr++] = baseIndex + numVertsPerRow + 1;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex;
}
}
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.normals = normals;
mesh.colors = ColorEx.GetFilledColorArray(numVerts, color);
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateTriangularPrism(Vector3 baseCenter, float baseWidth, float baseDepth, float topWidth, float topDepth, float height, Color color)
{
baseWidth = Mathf.Max(Mathf.Abs(baseWidth), 1e-4f);
baseDepth = Mathf.Max(Mathf.Abs(baseDepth), 1e-4f);
topWidth = Mathf.Max(Mathf.Abs(topWidth), 1e-4f);
topDepth = Mathf.Max(Mathf.Abs(topDepth), 1e-4f);
height = Mathf.Max(Mathf.Abs(height), 1e-4f);
List <Vector3> cornerPoints = PrismMath.CalcTriangPrismCornerPoints(baseCenter, baseWidth, baseDepth, topWidth, topDepth, height, Quaternion.identity);
Vector3 baseLeftPt = cornerPoints[(int)TriangularPrismCorner.BaseLeft];
Vector3 baseRightPt = cornerPoints[(int)TriangularPrismCorner.BaseRight];
Vector3 baseForwardPt = cornerPoints[(int)TriangularPrismCorner.BaseForward];
Vector3 topLeftPt = cornerPoints[(int)TriangularPrismCorner.TopLeft];
Vector3 topRightPt = cornerPoints[(int)TriangularPrismCorner.TopRight];
Vector3 topForwardPt = cornerPoints[(int)TriangularPrismCorner.TopForward];
Vector3[] positions = new Vector3[]
{
// Top face
topLeftPt, topForwardPt, topRightPt,
// Bottom face
baseLeftPt, baseRightPt, baseForwardPt,
// Back face
baseLeftPt, topLeftPt, topRightPt, baseRightPt,
// Left face
baseLeftPt, baseForwardPt, topForwardPt, topLeftPt,
// Right face
baseRightPt, topRightPt, topForwardPt, baseForwardPt
};
int[] indices = new int[]
{
// Top face
0, 1, 2,
// Bottom face
3, 4, 5,
// Back face
6, 7, 8,
8, 9, 6,
// Left face
10, 11, 12,
12, 13, 10,
// Right face
14, 15, 16,
16, 17, 14
};
Vector3 leftFaceNormal = Vector3.Cross((positions[11] - positions[10]), (positions[13] - positions[10])).normalized;
Vector3 rightFaceNormal = Vector3.Cross((positions[15] - positions[14]), (positions[17] - positions[14])).normalized;
Vector3[] normals = new Vector3[]
{
// Top face
Vector3.up, Vector3.up, Vector3.up,
// Bottom face
-Vector3.up, -Vector3.up, -Vector3.up,
// Back face
-Vector3.forward, -Vector3.forward, -Vector3.forward, -Vector3.forward,
// Left face
leftFaceNormal, leftFaceNormal, leftFaceNormal, leftFaceNormal,
// Right face
rightFaceNormal, rightFaceNormal, rightFaceNormal, rightFaceNormal
};
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.colors = ColorEx.GetFilledColorArray(positions.Length, color);
mesh.normals = normals;
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateBox(float width, float height, float depth, Color color)
{
if (width < 1e-4f)
{
return(null);
}
if (height < 1e-4f)
{
return(null);
}
if (depth < 1e-4f)
{
return(null);
}
float halfWidth = width * 0.5f;
float halfHeight = height * 0.5f;
float halfDepth = depth * 0.5f;
Vector3[] positions = new Vector3[]
{
// Front face
new Vector3(-halfWidth, -halfHeight, -halfDepth),
new Vector3(-halfWidth, halfHeight, -halfDepth),
new Vector3(halfWidth, halfHeight, -halfDepth),
new Vector3(halfWidth, -halfHeight, -halfDepth),
// Back face
new Vector3(halfWidth, -halfHeight, halfDepth),
new Vector3(halfWidth, halfHeight, halfDepth),
new Vector3(-halfWidth, halfHeight, halfDepth),
new Vector3(-halfWidth, -halfHeight, halfDepth),
// Top face
new Vector3(-halfWidth, halfHeight, -halfDepth),
new Vector3(-halfWidth, halfHeight, halfDepth),
new Vector3(halfWidth, halfHeight, halfDepth),
new Vector3(halfWidth, halfHeight, -halfDepth),
// Bottom face
new Vector3(halfWidth, -halfHeight, -halfDepth),
new Vector3(halfWidth, -halfHeight, halfDepth),
new Vector3(-halfWidth, -halfHeight, halfDepth),
new Vector3(-halfWidth, -halfHeight, -halfDepth),
// Left face
new Vector3(-halfWidth, -halfHeight, halfDepth),
new Vector3(-halfWidth, halfHeight, halfDepth),
new Vector3(-halfWidth, halfHeight, -halfDepth),
new Vector3(-halfWidth, -halfHeight, -halfDepth),
// Right face
new Vector3(halfWidth, -halfHeight, -halfDepth),
new Vector3(halfWidth, halfHeight, -halfDepth),
new Vector3(halfWidth, halfHeight, halfDepth),
new Vector3(halfWidth, -halfHeight, halfDepth)
};
Vector3[] normals = new Vector3[]
{
// Front face
-Vector3.forward, -Vector3.forward, -Vector3.forward, -Vector3.forward,
// Back face
Vector3.forward, Vector3.forward, Vector3.forward, Vector3.forward,
// Top face
Vector3.up, Vector3.up, Vector3.up, Vector3.up,
// Bottom face
-Vector3.up, -Vector3.up, -Vector3.up, -Vector3.up,
// Left face
-Vector3.right, -Vector3.right, -Vector3.right, -Vector3.right,
// Right face
Vector3.right, Vector3.right, Vector3.right, Vector3.right
};
int[] indices = new int[]
{
// Front face
0, 1, 2, 2, 3, 0,
// Back face
4, 5, 6, 6, 7, 4,
// Top face
8, 9, 10, 10, 11, 8,
// Bottom face
12, 13, 14, 14, 15, 12,
// Left face
16, 17, 18, 18, 19, 16,
// Right face
20, 21, 22, 22, 23, 20
};
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.normals = normals;
mesh.colors = ColorEx.GetFilledColorArray(24, color);
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateCylindricalTorus(Vector3 center, float coreRadius, float tubeHrzRadius, float tubeVertRadius, int numTubeSlices, Color color)
{
if (coreRadius < 1e-4f || tubeHrzRadius < 1e-4f || numTubeSlices < 3)
{
return(null);
}
int numVertsPerTubeSlice = 8;
int numVerts = numVertsPerTubeSlice * (numTubeSlices + 1);
Vector3[] positions = new Vector3[numVerts];
Vector3[] normals = new Vector3[numVerts];
Vector2[] radiusDirs = new Vector2[numVerts];
int vertexPtr = 0;
float tubeAngleStep = 360.0f / (numTubeSlices - 1);
for (int tubeSliceIndex = 0; tubeSliceIndex <= numTubeSlices; ++tubeSliceIndex)
{
float tubeAngle = tubeAngleStep * tubeSliceIndex * Mathf.Deg2Rad;
float cosTube = Mathf.Cos(tubeAngle);
float sinTube = Mathf.Sin(tubeAngle);
Vector3 tubeSliceCenterDir = new Vector3(sinTube, 0.0f, cosTube).normalized;
Vector3 tubeSliceCenter = center + tubeSliceCenterDir * coreRadius;
Vector2 radiusDir = new Vector2(tubeSliceCenterDir.x, tubeSliceCenterDir.z);
// Top
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter + Vector3.up * tubeVertRadius - tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = Vector3.up;
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter + Vector3.up * tubeVertRadius + tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = Vector3.up;
// Back
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter + Vector3.up * tubeVertRadius + tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = tubeSliceCenterDir;
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter - Vector3.up * tubeVertRadius + tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = tubeSliceCenterDir;
// Bottom
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter - Vector3.up * tubeVertRadius + tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = -Vector3.up;
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter - Vector3.up * tubeVertRadius - tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = -Vector3.up;
// Front
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter - Vector3.up * tubeVertRadius - tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = -tubeSliceCenterDir;
radiusDirs[vertexPtr] = radiusDir;
positions[vertexPtr] = tubeSliceCenter + Vector3.up * tubeVertRadius - tubeSliceCenterDir * tubeHrzRadius;
normals[vertexPtr++] = -tubeSliceCenterDir;
}
int indexPtr = 0;
int numIndices = numTubeSlices * 24;
int[] indices = new int[numIndices];
for (int tubeSliceIndex = 0; tubeSliceIndex < numTubeSlices - 1; ++tubeSliceIndex)
{
int baseIndex = tubeSliceIndex * numVertsPerTubeSlice;
// Top quad
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
// Back quad
baseIndex += 2;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
// Bottom quad
baseIndex += 2;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
// Front quad
baseIndex += 2;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
}
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.normals = normals;
mesh.uv2 = radiusDirs;
mesh.colors = ColorEx.GetFilledColorArray(numVerts, color);
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}
public static Mesh CreateTorus(Vector3 center, float coreRadius, float tubeRadius, int numTubeSlices, int numSlices, Color color)
{
if (coreRadius < 1e-4f || tubeRadius < 1e-4f || numTubeSlices < 3 || numSlices < 3)
{
return(null);
}
int numVertsPerTubeSlice = (numSlices + 1);
int numVerts = numVertsPerTubeSlice * (numTubeSlices + 1);
Vector3[] positions = new Vector3[numVerts];
Vector3[] normals = new Vector3[numVerts];
int vertexPtr = 0;
float outerAngleStep = 360.0f / (numSlices - 1);
float tubeAngleStep = 360.0f / (numTubeSlices - 1);
for (int tubeSliceIndex = 0; tubeSliceIndex <= numTubeSlices; ++tubeSliceIndex)
{
float tubeAngle = tubeAngleStep * tubeSliceIndex * Mathf.Deg2Rad;
float cosTube = Mathf.Cos(tubeAngle);
float sinTube = Mathf.Sin(tubeAngle);
Vector3 tubeSliceCenter = new Vector3(sinTube * coreRadius, 0.0f, cosTube * coreRadius);
for (int sliceIndex = 0; sliceIndex <= numSlices; ++sliceIndex)
{
float outerAngle = outerAngleStep * sliceIndex * Mathf.Deg2Rad;
float cosOuter = Mathf.Cos(outerAngle);
float sinOuter = Mathf.Sin(outerAngle);
Vector3 vPos = tubeSliceCenter;
vPos.x += sinTube * sinOuter * tubeRadius;
vPos.y += cosOuter * tubeRadius;
vPos.z += cosTube * sinOuter * tubeRadius;
vPos += center;
positions[vertexPtr] = vPos;
normals[vertexPtr] = (vPos - center).normalized;
++vertexPtr;
}
}
int indexPtr = 0;
int numIndices = numTubeSlices * numSlices * 6;
int[] indices = new int[numIndices];
for (int tubeSliceIndex = 0; tubeSliceIndex < numTubeSlices; ++tubeSliceIndex)
{
for (int sliceIndex = 0; sliceIndex < numSlices; ++sliceIndex)
{
int baseIndex = tubeSliceIndex * numVertsPerTubeSlice + sliceIndex;
indices[indexPtr++] = baseIndex;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + 1;
indices[indexPtr++] = baseIndex + 1 + numVertsPerTubeSlice;
indices[indexPtr++] = baseIndex + numVertsPerTubeSlice;
}
}
Mesh mesh = new Mesh();
mesh.vertices = positions;
mesh.normals = normals;
mesh.colors = ColorEx.GetFilledColorArray(numVerts, color);
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
mesh.UploadMeshData(false);
return(mesh);
}