92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
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package cone
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import (
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"zworld/engine/object"
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"zworld/engine/object/mesh"
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"zworld/engine/renderapi/color"
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"zworld/engine/renderapi/material"
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"zworld/engine/renderapi/vertex"
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"zworld/plugins/math"
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"zworld/plugins/math/vec3"
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)
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type Cone struct {
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object.Object
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*Mesh
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}
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func NewObject(args Args) *Cone {
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c := &Cone{
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Mesh: New(args),
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}
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c.Mesh.Name()
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c.Object.Name()
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return object.New("Cone", &Cone{
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Mesh: New(args),
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})
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}
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// A Cone is a forward rendered colored cone mesh
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type Mesh struct {
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*mesh.Static
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Args
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}
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type Args struct {
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Mat *material.Def
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Radius float32
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Height float32
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Segments int
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Color color.T
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}
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func New(args Args) *Mesh {
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if args.Mat == nil {
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args.Mat = material.ColoredForward()
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}
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cone := object.NewComponent(&Mesh{
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Static: mesh.New(args.Mat),
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Args: args,
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})
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cone.generate()
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return cone
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}
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func (c *Mesh) generate() {
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data := make([]vertex.C, 6*c.Segments)
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// cone
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top := vec3.New(0, c.Height, 0)
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sangle := 2 * math.Pi / float32(c.Segments)
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for i := 0; i < c.Segments; i++ {
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a1 := sangle * (float32(i) + 0.5)
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a2 := sangle * (float32(i) + 1.5)
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v1 := vec3.New(math.Cos(a1), 0, -math.Sin(a1)).Scaled(c.Radius)
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v2 := vec3.New(math.Cos(a2), 0, -math.Sin(a2)).Scaled(c.Radius)
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v1t, v2t := top.Sub(v1), top.Sub(v2)
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n := vec3.Cross(v1t, v2t).Normalized()
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o := 3 * i
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data[o+0] = vertex.C{P: v2, N: n, C: c.Color.Vec4()}
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data[o+1] = vertex.C{P: top, N: n, C: c.Color.Vec4()}
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data[o+2] = vertex.C{P: v1, N: n, C: c.Color.Vec4()}
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}
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// bottom
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base := vec3.Zero
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n := vec3.New(0, -1, 0)
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for i := 0; i < c.Segments; i++ {
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a1 := sangle * (float32(i) + 0.5)
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a2 := sangle * (float32(i) + 1.5)
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v1 := vec3.New(math.Cos(a1), 0, -math.Sin(a1)).Scaled(c.Radius)
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v2 := vec3.New(math.Cos(a2), 0, -math.Sin(a2)).Scaled(c.Radius)
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o := 3 * (i + c.Segments)
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data[o+0] = vertex.C{P: v1, N: n, C: c.Color.Vec4()}
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data[o+1] = vertex.C{P: base, N: n, C: c.Color.Vec4()}
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data[o+2] = vertex.C{P: v2, N: n, C: c.Color.Vec4()}
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}
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key := object.Key("cone", c)
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mesh := vertex.NewTriangles(key, data, []uint16{})
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c.VertexData.Set(mesh)
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}
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