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lua/arccw/shared/sh_util.lua

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+--[[
+| This file was obtained through the combined efforts
+| of Madbluntz & Plymouth Antiquarian Society.
+|
+| Credits: lifestorm, Gregory Wayne Rossel JR.,
+| 	Maloy, DrPepper10 @ RIP, Atle!
+|
+| Visit for more: https://plymouth.thetwilightzone.ru/
+--]]
+
+-- Works around the 10 bodygroup limit on ENTITY:SetBodyGroups()
+function ArcCW.SetBodyGroups(mdl, bodygroups)
+    mdl:SetBodyGroups(bodygroups)
+    local len = string.len(bodygroups or "")
+    for i = 10, len - 1 do
+        mdl:SetBodygroup(i, tonumber(string.sub(bodygroups, i + 1, i + 2)))
+    end
+end
+
+-- doesn't work
+function ArcCW.RotateAroundPoint(pos, ang, point, offset, offset_ang)
+    local v = Vector(0, 0, 0)
+    v = v + (point.x * ang:Right())
+    v = v + (point.y * ang:Forward())
+    v = v + (point.z * ang:Up())
+
+    local newang = Angle()
+    newang:Set(ang)
+
+    newang:RotateAroundAxis(ang:Right(), offset_ang.p)
+    newang:RotateAroundAxis(ang:Forward(), offset_ang.r)
+    newang:RotateAroundAxis(ang:Up(), offset_ang.y)
+
+    v = v + newang:Right() * offset.x
+    v = v + newang:Forward() * offset.y
+    v = v + newang:Up() * offset.z
+
+    -- v:Rotate(offset_ang)
+
+    v = v - (point.x * newang:Right())
+    v = v - (point.y * newang:Forward())
+    v = v - (point.z * newang:Up())
+
+    return v + pos, newang
+end
+
+function ArcCW.RotateAroundPoint2(pos, ang, point, offset, offset_ang)
+
+    -- debugoverlay.Cross(point, 1, 1, Color(255, 0, 0), true)
+
+    local mat = Matrix()
+    mat:SetTranslation(pos)
+    mat:SetAngles(ang)
+    -- debugoverlay.Cross(pos, 1.5, 1, Color(0, 0, 255), true)
+    -- debugoverlay.Line(mat:GetTranslation(), mat:GetTranslation() + ang:Forward() * 32, 1, color_white, true)
+    -- debugoverlay.Line(mat:GetTranslation(), point, 1, Color(255, 150, 150), true)
+
+    mat:Translate(point)
+    -- debugoverlay.Cross(mat:GetTranslation(), 2, 1, Color(255, 0, 255), true)
+
+    local rot_mat = Matrix()
+    rot_mat:SetAngles(offset_ang)
+    rot_mat:Invert()
+    mat:Mul(rot_mat)
+
+    --mat:Rotate(offset_ang)
+    mat:Translate(-point)
+
+    mat:Translate(offset)
+
+    -- debugoverlay.Cross(mat:GetTranslation(), 1, 1, Color(0, 255, 0), true)
+    -- debugoverlay.Line(mat:GetTranslation(), mat:GetTranslation() + mat:GetAngles():Forward() * 8, 1, Color(0, 255, 0), true)
+
+    return mat:GetTranslation(), mat:GetAngles()
+end
+
+-- See https://wiki.facepunch.com/gmod/Entity:GetAttachment
+function ArcCW.FormatViewModelAttachment(nFOV, vOrigin, bFrom)
+    local vEyePos = EyePos()
+    local aEyesRot = EyeAngles()
+    local vOffset = vOrigin - vEyePos
+    local vForward = aEyesRot:Forward()
+    local nViewX = math.tan(nFOV * math.pi / 360)
+
+    if nViewX == 0 then
+        vForward:Mul(vForward:Dot(vOffset))
+        vEyePos:Add(vForward)
+
+        return vEyePos
+    end
+
+    -- FIXME: LocalPlayer():GetFOV() should be replaced with EyeFOV() when it's binded
+    local nWorldX = math.tan(LocalPlayer():GetFOV() * math.pi / 360)
+
+    if nWorldX == 0 then
+        vForward:Mul(vForward:Dot(vOffset))
+        vEyePos:Add(vForward)
+
+        return vEyePos
+    end
+
+    local vRight = aEyesRot:Right()
+    local vUp = aEyesRot:Up()
+
+    if bFrom then
+        local nFactor = nWorldX / nViewX
+        vRight:Mul(vRight:Dot(vOffset) * nFactor)
+        vUp:Mul(vUp:Dot(vOffset) * nFactor)
+    else
+        local nFactor = nViewX / nWorldX
+        vRight:Mul(vRight:Dot(vOffset) * nFactor)
+        vUp:Mul(vUp:Dot(vOffset) * nFactor)
+    end
+
+    vForward:Mul(vForward:Dot(vOffset))
+    vEyePos:Add(vRight)
+    vEyePos:Add(vUp)
+    vEyePos:Add(vForward)
+
+    return vEyePos
+end