extern private void SetIndicesNativeArrayImpl(int submesh, MeshTopology topology, UnityEngine.Rendering.IndexFormat indicesFormat, IntPtr indices, int arrayStart, int arraySize, bool calculateBounds, int baseVertex);
// Display routine for 2d examples in the main program
void display2()
{
// to push and pop location and angle
Stack <float> positions = new Stack <float>();
Stack <float> angles = new Stack <float>();
// current angle and position
float angle = 0f;
float3 position = new float3(0, 0, 0);
float posy = 0.0f;
float posx = 0.0f;
// positions to draw towards
float3 newPosition;
float2 rotated;
// start at 0,0,0
// Apply the drawing rules to the string given to us
for (int i = 0; i < lang.Count; i++)
{
byte buff = lang[i];
switch (buff)
{
case 0:
// draw a line ending in a leaf
posy += initial_length;
newPosition = new float3(position.x, posy, 0);
rotated = rotate(position, new float3(position.x, posy, 0), angle);
newPosition = new float3(rotated.x, rotated.y, 0);
addLineToMesh(lineMesh, position, new float3(rotated.x, rotated.y, 0), Color.green);
//drawLSystemLine(position, new Vector3(rotated.x, rotated.y, 0), line, Color.red);
// set up for the next draw
position = newPosition;
posx = newPosition.x;
posy = newPosition.y;
addCircleToMesh(lineMesh, 0.45f, 0.45f, position, Color.magenta);
break;
case 1:
// draw a line
posy += initial_length;
newPosition = new float3(position.x, posy, 0);
rotated = rotate(position, new float3(position.x, posy, 0), angle);
newPosition = new float3(rotated.x, rotated.y, 0);
//drawLSystemLine(position, newPosition, line, Color.green);
addLineToMesh(lineMesh, position, newPosition, Color.green);
// set up for the next draw
position = newPosition;
posx = newPosition.x;
posy = newPosition.y;
break;
case 6:
//[: push position and angle, turn left 45 degrees
positions.Push(posy);
positions.Push(posx);
float currentAngle = angle;
angles.Push(currentAngle);
angle -= 45;
break;
case 9:
//]: pop position and angle, turn right 45 degrees
posx = positions.Pop();
posy = positions.Pop();
position = new float3(posx, posy, 0);
angle = angles.Pop();
angle += 45;
break;
default: break;
}
// after we recreate the mesh we need to assign it to the original object
MeshUpdateFlags flags = MeshUpdateFlags.DontNotifyMeshUsers & MeshUpdateFlags.DontRecalculateBounds &
MeshUpdateFlags.DontResetBoneBounds & MeshUpdateFlags.DontValidateIndices;
// set vertices
var layout = new[]
{
new VertexAttributeDescriptor(VertexAttribute.Position, VertexAttributeFormat.Float32, 3),
new VertexAttributeDescriptor(VertexAttribute.Color, VertexAttributeFormat.UNorm8, 4)
};
lineMesh.SetVertexBufferParams(vertices.Count, layout);
lineMesh.SetVertexBufferData(vertices, 0, 0, vertices.Count, 0, flags);
// set indices
UnityEngine.Rendering.IndexFormat format = IndexFormat.UInt32;
lineMesh.SetIndexBufferParams(indices.Count, format);
lineMesh.SetIndexBufferData(indices, 0, 0, indices.Count, flags);
// set submesh
SubMeshDescriptor desc = new SubMeshDescriptor(0, indices.Count, MeshTopology.Lines);
desc.bounds = new Bounds();
desc.baseVertex = 0;
desc.firstVertex = 0;
desc.vertexCount = vertices.Count;
lineMesh.SetSubMesh(0, desc, flags);
}
}
extern public void SetIndexBufferParams(int indexCount, UnityEngine.Rendering.IndexFormat format);
private void SetTrianglesImpl(int submesh, UnityEngine.Rendering.IndexFormat indicesFormat, System.Array triangles, int trianglesArrayLength, int start, int length, bool calculateBounds, int baseVertex)
{
CheckIndicesArrayRange(triangles, trianglesArrayLength, start, length);
SetIndicesImpl(submesh, MeshTopology.Triangles, indicesFormat, triangles, start, length, calculateBounds, baseVertex);
}
