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basicmesh.cljc
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basicmesh.cljc
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(ns thi.ng.geom.basicmesh
(:require
[thi.ng.geom.core :as g]
[thi.ng.geom.utils :as gu]
[thi.ng.geom.vector :as v :refer [vec2 vec3]]
[thi.ng.geom.matrix :refer [M44]]
[thi.ng.geom.meshface :as mf]
[thi.ng.geom.types :as types]
[thi.ng.dstruct.core :as d]
[thi.ng.math.core :as m :refer [*eps*]]
[thi.ng.xerror.core :as err]
[clojure.core.reducers :as r]))
(declare basic-mesh)
(defn- add-face*
[mesh [fverts]]
(thi.ng.geom.types.BasicMesh.
(into (get mesh :vertices) fverts)
(conj (get mesh :faces) (thi.ng.geom.meshface.MeshFace. fverts nil))
(get mesh :fnormals)))
(defn basic-mesh
"Builds a new 3d mesh data structure and (optionally) populates it with
the given items (a seq of existing meshes and/or faces). Faces are defined
as vectors of their vertices."
[] (thi.ng.geom.types.BasicMesh. #{} #{} {}))
(extend-type thi.ng.geom.types.BasicMesh
g/IArea
(area
[_] (gu/total-area-3d (mf/xf-face-verts _) (get _ :faces)))
g/IBounds
(bounds [_] (gu/bounding-box (seq (get _ :vertices))))
(width [_] (gu/axis-range 0 (get _ :vertices)))
(height [_] (gu/axis-range 1 (get _ :vertices)))
(depth [_] (gu/axis-range 2 (get _ :vertices)))
g/IBoundingSphere
(bounding-sphere
[_] (gu/bounding-sphere (g/centroid _) (get _ :vertices)))
g/ICenter
(center
([_] (g/center _ (vec3)))
([_ o] (g/translate _ (m/- o (g/centroid _)))))
(centroid
[_] (gu/centroid (seq (get _ :vertices))))
g/IFlip
(flip [_] (gu/map-mesh (fn [f] [(vec (rseq f))]) _))
g/IVertexAccess
(vertices
[_] (get _ :vertices))
g/IEdgeAccess
(edges
[_]
(into
#{}
(comp
(map #(g/vertices % _))
(mapcat #(d/successive-nth 2 (conj % (first %))))
(map set))
(get _ :faces)))
g/IFaceAccess
(faces
([_] (get _ :faces))
([_ opts]
(if opts
(map #(g/raw % _) (get _ :faces))
(get _ :faces))))
(add-face
[_ face] (add-face* _ face))
(vertex-faces
[_ v]
(sequence
(comp
(map #(g/vertices % _))
(filter
#(pos? #?(:clj (.indexOf ^clojure.lang.PersistentVector % v)
:cljs (d/index-of % v))))
(get _ :faces))))
(remove-face
[_ f]
(err/unsupported!)) ;; TODO implement
g/INormalAccess
(face-normals
[_ force?] (if (seq (get _ :fnormals)) (get _ :fnormals) (if force? (get (g/compute-face-normals _) :fnormals))))
(face-normal
[_ f] (get (get _ :fnormals) f))
(vertex-normals
[_ force?] (if force? (err/unsupported!)))
(vertex-normal
[_ v] (err/unsupported!))
(compute-face-normals
[_]
(loop [fnorms (transient {}), faces (get _ :faces)]
(if faces
(let [f (first faces)]
(recur (assoc! fnorms f (gu/ortho-normal (g/vertices f _))) (next faces)))
(assoc _ :fnormals (persistent! fnorms)))))
(compute-vertex-normals
[_] (err/unsupported!))
g/IGeomContainer
(into
[_ faces] (gu/into-mesh _ add-face* faces))
g/IClear
(clear*
[_] (basic-mesh))
g/IMeshConvert
(as-mesh
([_] _)
([_ opts] (g/into (get opts :mesh) (get _ :faces))))
g/ITessellate
(tessellate
([_] (g/tessellate _ {}))
([_ opts] (gu/map-mesh (or (get opts :fn) (gu/tessellate-face gu/tessellate-with-first)) _)))
g/IScale
(scale
[_ s] (gu/transform-mesh _ add-face* #(m/* % s)))
(scale-size
[_ s]
(let [c (g/centroid _)]
(gu/transform-mesh _ add-face* #(m/madd (m/- % c) s c))))
g/ITranslate
(translate
[_ t] (gu/transform-mesh _ add-face* #(m/+ % t)))
g/ITransform
(transform
[_ m]
(gu/transform-mesh _ add-face* m))
g/IVolume
(volume
[_] (gu/total-volume (mf/xf-face-verts _) (get _ :faces))))