chengkehan

// Convert tiling from UnityTerrain to CustomTerrain
material.SetTextureScale("_Splat0", new Vector2(1.0f / terrainLayer.tileSize.x * terrainData.size.x, 1.0f / terrainLayer.tileSize.y * terrainData.size.z))

chengkehan

// rotation and transform a 2d array
// aniticlockwise 90 degree
Vector2[] tUV2 = new Vector2[tUV.Length];
System.Array.Copy(tUV, 0, tUV2, 0, tUV.Length);
for (int pi = 0; pi < h; ++pi)
{
    for (int pj = 0; pj < w; ++pj)
    {
        Vector2 pc = tUV2[pi * w + pj];
        tUV[(w - pj - 1) * w + pi] = pc;

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Vector3 pos = targetTransform.position;
Matrix4x4 vp = mainCamera.projectionMatrix * mainCamera.worldToCameraMatrix;
Vector4 porjPos = vp * new Vector4(pos.x, pos.y, pos.z, 1);
// projPos.xyz / projPos.w [-1, 1] in view frustum

chengkehan

private Vector3 AnchoredPositionToWorldPosition(Vector2 anchoredPosition)
{
    Vector2 canvasSize = canvasRectTransform.sizeDelta;

    Vector2 viewportPosition = new Vector2(
        (anchoredPosition.x + (canvasSize.x * 0.5f)) / canvasSize.x,
        (anchoredPosition.y + (canvasSize.y * 0.5f)) / canvasSize.y
    );
    Vector3 worldPosition = CameraManager.GetInstance().GetUICamera().ViewportToWorldPoint(viewportPosition);
    worldPosition.z = canvasRectTransform.position.z;