private void DrawLivePreview(GStylizedTerrain t, Camera cam)
        {
            if (t.transform.rotation != Quaternion.identity ||
                t.transform.lossyScale != Vector3.one)
            {
                return;
            }

            Mesh          previewMesh = GGriffinSettings.Instance.GetLivePreviewMesh(t.TerrainData.Geometry.MeshResolution);
            RenderTexture rt          = GetPreviewTexture(t);

            instance.Internal_Apply(t, rt, instance.SplineCreator.Editor_Vertices);
            Vector3 terrainSize = new Vector3(
                t.TerrainData.Geometry.Width,
                t.TerrainData.Geometry.Height,
                t.TerrainData.Geometry.Length);

            previewPropertyBlock.Clear();
            previewPropertyBlock.SetTexture("_OldHeightMap", t.TerrainData.Geometry.HeightMap);
            previewPropertyBlock.SetTexture("_NewHeightMap", rt);
            previewPropertyBlock.SetTexture("_MainTex", rt);
            previewPropertyBlock.SetFloat("_Height", t.TerrainData.Geometry.Height);
            previewPropertyBlock.SetVector("_BoundMin", t.transform.position);
            previewPropertyBlock.SetVector("_BoundMax", t.transform.TransformPoint(terrainSize));

            Material mat = GInternalMaterials.GeometryLivePreviewMaterial;

            List <Rect> uvRects = new List <Rect>(instance.SplineCreator.SweepDirtyRect(t));

            for (int i = 0; i < uvRects.Count; ++i)
            {
                Rect    r        = uvRects[i];
                Vector3 localPos = new Vector3(
                    terrainSize.x * r.x,
                    0f,
                    terrainSize.z * r.y);
                Vector3    worldPos = t.transform.TransformPoint(localPos);
                Quaternion rotation = Quaternion.identity;
                Vector3    scale    = new Vector3(terrainSize.x * r.width, 1, terrainSize.z * r.height);

                Graphics.DrawMesh(
                    previewMesh,
                    Matrix4x4.TRS(worldPos, rotation, scale),
                    mat,
                    LayerMask.NameToLayer("Default"),
                    cam,
                    0,
                    previewPropertyBlock);
            }
        }
        private void DrawLivePreview(GStylizedTerrain t, Camera cam)
        {
            if (t.transform.rotation != Quaternion.identity ||
                t.transform.lossyScale != Vector3.one)
            {
                return;
            }

            Mesh          previewMesh = GEditorSettings.Instance.livePreview.GetTriangleMesh(t.TerrainData.Geometry.MeshResolution);
            RenderTexture rt          = GetPreviewTexture(t);

            instance.Internal_Apply(t, rt, instance.SplineCreator.Editor_Vertices);

            List <Rect> uvRects = new List <Rect>(instance.SplineCreator.SweepDirtyRect(t));
            Rect        r       = GUtilities.MergeRects(uvRects);

            GLivePreviewDrawer.DrawGeometryLivePreview(t, cam, rt, r);
        }