[Unity] 커스텀 타일맵 1 - Grid 생성

결과물

---

격자 생성 (1)

gridSize를 입력받아 n x n 사이즈의 격자를 그리도록 했다.

변수
👉 gridSize : 격자 크기
👉 floorIndex : 오브젝트를 그릴 층
👉 floorSpaceSize : 층 사이 간격

void DrawGrid()
{
    Handles.color = Color.cyan;
    Handles.zTest = UnityEngine.Rendering.CompareFunction.Less;	// 🐸
    
    var verticalOffset = Vector3.up * floorIndex * floorSpaceSize;
    var gridCenterToTilemap = (editTilemap.transform.position + (new Vector3(1f, 0f, 1f) * floorSpaceSize * gridSize * 0.5f))
            - editTilemap.transform.position;

    for (int lineIndex = 0; lineIndex <= gridSize; ++lineIndex)
    {
        var sideOffsetAmount = lineIndex;

        var start = editTilemap.transform.position + (Vector3.right * sideOffsetAmount);
        var end = editTilemap.transform.position + (Vector3.forward * gridSize) 
            + (Vector3.right * sideOffsetAmount);

        Handles.DrawLine(start + verticalOffset - gridCenterToTilemap, end + verticalOffset - gridCenterToTilemap);

        start = editTilemap.transform.position + (Vector3.forward * sideOffsetAmount);
        end = editTilemap.transform.position + (Vector3.right * gridSize) 
            + (Vector3.forward * sideOffsetAmount);

        Handles.DrawLine(start + verticalOffset - gridCenterToTilemap, end + verticalOffset - gridCenterToTilemap);
    }
}

🐸 오브젝트 위에 격자가 보이지 않게
Handles.zTest = UnityEngine.Rendering.CompareFunction.Less;

해당 방식으로 격자를 그렸을때 문제가 하나 발생했다.

gridSize가 짝수일 때 그리드가 원하는 위치에 생성되지 않았다.

격자 생성 (2)

for (int lineIndex = 0; lineIndex <= gridSize; ++lineIndex)
{
    var sideOffsetAmount = lineIndex;
    var calcOffset = gridSize % 2 == 0 ? 0.5f : 0f;

    var start = editTilemap.transform.position + (Vector3.right * (sideOffsetAmount + calcOffset)) + (Vector3.forward * calcOffset);
    var end = editTilemap.transform.position + (Vector3.forward * (gridSize + calcOffset))
        + (Vector3.right * (sideOffsetAmount + calcOffset));

    Handles.DrawLine(start + verticalOffset - gridCenterToTilemap, end + verticalOffset - gridCenterToTilemap);

    start = editTilemap.transform.position + (Vector3.forward * (sideOffsetAmount + calcOffset)) + (Vector3.right * calcOffset);
    end = editTilemap.transform.position + (Vector3.right * (gridSize + calcOffset))
        + (Vector3.forward * (sideOffsetAmount + calcOffset));

    Handles.DrawLine(start + verticalOffset - gridCenterToTilemap, end + verticalOffset - gridCenterToTilemap);
}

calcOffset 변수를 추가하여 gridSize가 짝수일때는 0.5칸씩 옮겨서 그려질수 있도록 했다.

정상적으로 잘 그려진다.

참고
👀 https://velog.io/@gold715/Map-tool-%EA%B5%AC%ED%98%841
👀 https://junwe99.tistory.com/39
👀 https://bloodstrawberry.tistory.com/1063
👀 https://assetstore.unity.com/packages/tools/level-design/fabgrid-level-editor-175642