132 lines
3.8 KiB
Plaintext
132 lines
3.8 KiB
Plaintext
local function pr(...)
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local debug = false
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if debug then
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printf("aol_bbox_collision: " .. ...)
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end
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end
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-- helper functions
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local function diagonal_length(a,b)
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return math.sqrt((a*a) + (b*b))
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end
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-- used to generate coordinates in local space of bounding box from dimensions
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-- each index corresponds to a vertex
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-- local space origin is at center of box
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local box_local_matrix = {
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vector():set(-0.5, -0.5, -0.5), -- bottom, top right
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vector():set(0.5, -0.5, -0.5), -- bottom, top left
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vector():set(-0.5, -0.5, 0.5), -- bottom, bottom right
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vector():set(0.5, -0.5, 0.5), -- bottom, bottom left
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vector():set(-0.5, 0.5, -0.5), -- top, top right
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vector():set(0.5, 0.5, -0.5), -- top, top left
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vector():set(-0.5, 0.5, 0.5), -- top, bottom right
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vector():set(0.5, 0.5, 0.5), -- top, bottom left
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}
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local ray_pairs = {
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-- Orthogonals
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-- bottom plane
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{1,2},
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{1,3},
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{2,4},
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{3,4},
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-- top plane
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{5,6},
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{5,7},
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{6,8},
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{7,8},
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-- upward edges
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{1,5},
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{3,7},
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{4,8},
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{2,6},
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-- Diagonals
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-- bottom plane
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{1,4},
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{2,3},
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-- top plane
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{6,7},
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{5,8},
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-- front plane
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{3,8},
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{4,7},
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-- back plane
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{1,6},
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{2,5},
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-- left plane
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{2,8},
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{4,6},
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-- right plane
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{1,7},
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{3,5}
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}
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-- Class for handling collisions with a bounding box, defined by its dimensions and origin
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class "bbox_collider" (aol_bshape.bshape_collider)
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function bbox_collider:__init(width, length, height, world_origin, local_origin, rotation)
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super(world_origin, local_origin, rotation)
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-- Stores dimensions of the bounding box
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self.bbox_dims = {
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width = width,
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length = length,
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height = height,
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}
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self.ray_pairs = ray_pairs
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self.ray_pair_i2length = {
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-- Orthogonals
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-- bottom plane
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[1] = self.bbox_dims.width,
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[2] = self.bbox_dims.length,
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[3] = self.bbox_dims.length,
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[4] = self.bbox_dims.width,
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-- top plane
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[5] = self.bbox_dims.width,
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[6] = self.bbox_dims.length,
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[7] = self.bbox_dims.length,
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[8] = self.bbox_dims.width,
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-- upward edges
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[9] = self.bbox_dims.height,
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[10] = self.bbox_dims.height,
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[11] = self.bbox_dims.height,
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[12] = self.bbox_dims.height,
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-- Diagonals
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-- bottom plane
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[13] = diagonal_length(self.bbox_dims.width,self.bbox_dims.length),
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[14] = diagonal_length(self.bbox_dims.width,self.bbox_dims.length),
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-- top plane
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[15] = diagonal_length(self.bbox_dims.width,self.bbox_dims.length),
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[16] = diagonal_length(self.bbox_dims.width,self.bbox_dims.length),
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-- front plane
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[17] = diagonal_length(self.bbox_dims.width,self.bbox_dims.height),
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[18] = diagonal_length(self.bbox_dims.width,self.bbox_dims.height),
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-- back plane
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[19] = diagonal_length(self.bbox_dims.width,self.bbox_dims.height),
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[20] = diagonal_length(self.bbox_dims.width,self.bbox_dims.height),
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-- left plane
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[21] = diagonal_length(self.bbox_dims.length,self.bbox_dims.height),
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[22] = diagonal_length(self.bbox_dims.length,self.bbox_dims.height),
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-- right plane
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[23] = diagonal_length(self.bbox_dims.length,self.bbox_dims.height),
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[24] = diagonal_length(self.bbox_dims.length,self.bbox_dims.height)
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}
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self:UpdateVertices()
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self:UpdateBBox()
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end
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function bbox_collider:UpdateVertices()
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for i, pos in ipairs(box_local_matrix) do
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local vertex_pos = vec_add(pos, self.local_origin)
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vertex_pos.x = vertex_pos.x*self.bbox_dims.width
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vertex_pos.y = vertex_pos.y*self.bbox_dims.height
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vertex_pos.z = vertex_pos.z*self.bbox_dims.length
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self.vertices[i] = vertex_pos
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end
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end |