55 lines
1.9 KiB
Plaintext
55 lines
1.9 KiB
Plaintext
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class "geometry_ray"
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--[[
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(At least one range parameter should be specified)
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ray_range:
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Defines the total range of the ray. If you want to attach the ray to
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a fast moving object it is good to extend the ray so that you can reduce
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the polling rate by using the get function.
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contact_range:
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Defines the distance at which the result will report being in contact.
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You can skip it or set it to a value lower than the ray_range to
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still be able to get the intersection position from the result while
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marking the ray as not being in contact yet
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distance_offset:
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Defines how much the intersection position is offset.
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You can use both positive and negative values or you can leave it blank.
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flags (bit map = values can be added together for combined effect):
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0 : None
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1 : Objects
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2 : Statics
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4 : Shapes
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8 : Obstacles
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]]--
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function geometry_ray:__init(ray_range, contact_range, distance_offset, flags)
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if ray_range == nil and contact_range == nil then
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return nil
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end
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self.ray_range = ray_range or contact_range
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self.contact_range = contact_range or ray_range
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self.distance_offset = distance_offset ~= nil and distance_offset or 0
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self.ray = ray_pick()
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self.ray:set_flags(flags or 2)
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self.ray:set_range(self.ray_range)
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end
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--[[
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position:
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position from which the ray will start
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direction:
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direction in which the ray will be fired
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]]--
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function geometry_ray:get(position, direction)
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if position == nil or direction == nil then
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return nil
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end
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self.ray:set_position(position)
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self.ray:set_direction(direction)
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local distance = self.ray:query() and self.ray:get_distance() or self.ray_range
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local result = {}
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result.in_contact = distance <= self.contact_range
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result.position = position:add(direction:mul(distance + self.distance_offset))
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return result
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end
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