/// @endcond
private void DrawDirectivityPattern(int size)
{
directivityTexture.Resize(size, size);
// Draw the axes.
Color axisColor = 0.5f * Color.black;
for (int i = 0; i < size; ++i)
{
directivityTexture.SetPixel(i, size / 2, axisColor);
directivityTexture.SetPixel(size / 2, i, axisColor);
}
// Draw the 2D polar directivity pattern.
Color cardioidColor = 0.75f * Color.blue;
float offset = 0.5f * size;
float cardioidSize = 0.45f * size;
Vector2[] vertices = GvrAudio.Generate2dPolarPattern(directivityAlpha.floatValue,
directivitySharpness.floatValue, 180);
for (int i = 0; i < vertices.Length; ++i)
{
directivityTexture.SetPixel((int)(offset + cardioidSize * vertices[i].x),
(int)(offset + cardioidSize * vertices[i].y),
cardioidColor);
}
directivityTexture.Apply();
// Show the texture.
GUILayout.Box(directivityTexture);
}
// Draws a 3D gizmo in the Scene View that shows the selected directivity pattern.
private void DrawDirectivityGizmo(Transform target, float alpha, float sharpness,
int resolution)
{
Vector2[] points = GvrAudio.Generate2dPolarPattern(alpha, sharpness, resolution);
// Compute |vertices| from the polar pattern |points|.
int numVertices = resolution + 1;
Vector3[] vertices = new Vector3[numVertices];
vertices[0] = Vector3.zero;
for (int i = 0; i < points.Length; ++i)
{
vertices[i + 1] = new Vector3(points[i].x, 0.0f, points[i].y);
}
// Generate |triangles| from |vertices|. Two triangles per each sweep to avoid backface culling.
int[] triangles = new int[6 * numVertices];
for (int i = 0; i < numVertices - 1; ++i)
{
int index = 6 * i;
if (i < numVertices - 2)
{
triangles[index] = 0;
triangles[index + 1] = i + 1;
triangles[index + 2] = i + 2;
}
else
{
// Last vertex is connected back to the first for the last triangle.
triangles[index] = 0;
triangles[index + 1] = numVertices - 1;
triangles[index + 2] = 1;
}
// The second triangle facing the opposite direction.
triangles[index + 3] = triangles[index];
triangles[index + 4] = triangles[index + 2];
triangles[index + 5] = triangles[index + 1];
}
// Construct a new mesh for the gizmo.
Mesh directivityGizmoMesh = new Mesh();
directivityGizmoMesh.hideFlags = HideFlags.DontSaveInEditor;
directivityGizmoMesh.vertices = vertices;
directivityGizmoMesh.triangles = triangles;
directivityGizmoMesh.RecalculateNormals();
// Draw the mesh.
Vector3 scale = 2.0f * Mathf.Max(target.lossyScale.x, target.lossyScale.z) * Vector3.one;
Gizmos.DrawMesh(directivityGizmoMesh, target.position, target.rotation, scale);
}
