func NewDefaultMesh() *Mesh {
return NewMesh(core.NewGeometry(), materials.NewMeshBasicMaterial(map[string]interface{}{"color": rand.Intn(0xffffff)}))
}
func NewBoxGeometry(width, height, depth float64, widthSegments, heightSegments, depthSegments int) *BoxGeometry {
g := &BoxGeometry{
core.NewGeometry(),
Width: width,
Height: height,
Depth: depth,
WidthSegments: widthSegments,
HeightSegments: heightSegments,
DepthSegments: depthSegments,
}
g.Type = "BoxGeometry"
g.Parameters = map[string]interface{}{
"width": width,
"height": height,
"depth": depth,
"widthSegments": widthSegments,
"heightSegments": heightSegments,
"depthSegments": depthSegments,
}
scope := g
width_half := width / 2
height_half := height / 2
depth_half := depth / 2
buildPlane := func(u, v string, udir, vdir int, width, height, depth float64, materialIndex int) {
// w, ix, iy,
var w string
gridX := scope.WidthSegments
gridY := scope.HeightSegments
width_half := width / 2
height_half := height / 2
offset := len(scope.Vertices)
if (u == "x" && v == "y") || (u == "y" && v == "x") {
w = "z"
} else if (u == "x" && v == "z") || (u == "z" && v == "x") {
w = "y"
gridY = scope.DepthSegments
} else if (u == "z" && v == "y") || (u == "y" && v == "z") {
w = "x"
gridX = scope.DepthSegments
}
gridX1 := gridX + 1
gridY1 := gridY + 1
segment_width := width / gridX
segment_height := height / gridY
normal := math3d.NewEmptyVector3()
if depth > 0 {
three.SetField(normal, w, 1)
} else {
three.SetField(normal, w, -1)
}
for iy := 0; iy < gridY1; iy++ {
for ix := 0; ix < gridX1; ix++ {
var vector = math3d.NewEmptyVector3()
three.SetField(vector, u, (ix*segment_width-width_half)*udir)
three.SetField(vector, v, (iy*segment_height-height_half)*vdir)
three.SetField(vector, w, depth)
scope.Vertices = append(scope.Vertices, vector)
}
}
for iy := 0; iy < gridY; iy++ {
for ix := 0; ix < gridX; ix++ {
a := ix + gridX1*iy
b := ix + gridX1*(iy+1)
c := (ix + 1) + gridX1*(iy+1)
d := (ix + 1) + gridX1*iy
uva := math3d.NewVector2(ix/gridX, 1-iy/gridY)
uvb := math3d.NewVector2(ix/gridX, 1-(iy+1)/gridY)
uvc := math3d.NewVector2((ix+1)/gridX, 1-(iy+1)/gridY)
uvd := math3d.NewVector2((ix+1)/gridX, 1-iy/gridY)
face := core.NewDefaultFace3(a+offset, b+offset, d+offset)
face.Normal.Copy(normal)
face.VertexNormals = append(face.VertexNormals, normal.Clone(), normal.Clone(), normal.Clone())
face.MaterialIndex = materialIndex
scope.Faces = append(scope.Faces, face)
scope.FaceVertexUvs[0] = append(scope.FaceVertexUvs[0], []*math3d.Vector2{uva, uvb, uvd})
face = core.NewDefaultFace3(b+offset, c+offset, d+offset)
face.Normal.Copy(normal)
face.VertexNormals = append(face.VertexNormals, normal.Clone(), normal.Clone(), normal.Clone())
face.MaterialIndex = materialIndex
scope.Faces = append(scope.Faces, face)
scope.FaceVertexUvs[0] = append(scope.FaceVertexUvs[0], []*math3d.Vector2{uvb.Clone(), uvc, uvd.Clone()})
}
}
}
buildPlane("z", "y", -1, -1, depth, height, width_half, 0) // px
buildPlane("z", "y", 1, -1, depth, height, -width_half, 1) // nx
buildPlane("x", "z", 1, 1, width, depth, height_half, 2) // py
buildPlane("x", "z", 1, -1, width, depth, -height_half, 3) // ny
buildPlane("x", "y", 1, -1, width, height, depth_half, 4) // pz
buildPlane("x", "y", -1, -1, width, height, -depth_half, 5) // nz
g.MergeVertices()
return g
}