source: code/branches/spacegate/data/levels/includes/asteroidField.lua @ 9258

--[[ fog generator
generates fog
        posX, posY, posZ - position in space
        size - size of billboard
        brightness - [0,1] fog brightness
--]]
function generateFog(posX, posY, posZ, size, brightness)
                print("<Billboard ")
                        print("position = \"") 
                                print(posX) print(",") 
                                print(posY) print(",") 
                                print(posZ) print("\" ") 
                        print("colour=\"")
                                print(brightness) print(",") 
                                print(brightness) print(",") 
                                print(brightness) print("\" ") 
                        print("material=\"Smoke/Smoke\" scale=")
                        print(size)
                        print(" />")
end

--[[ asteroid field generator
generates asteroid field
        posX, posY, posZ - position in space
        minSize, maxSize - size boundaries of each asteroid
        radius - size of the cube around position in space
        count - number of asteroids
        fog - enable fog 0/1
--]]
function asteroidField(posX, posY, posZ, minSize, maxSize, radius, count, fog)
        for i = 1, count, 1
        do
                size = (math.random() * (maxSize - minSize)) + minSize
                pX = (2 * math.random() * radius) - radius + posX
                pY = (2 * math.random() * radius) - radius + posY
                pZ = (2 * math.random() * radius) - radius + posZ
                print("<StaticEntity ")
                
                print("position = \"") 
                print(pX) print(",") 
                print(pY) print(",") 
                print(pZ) print("\" ")
                
                print("scale = \"") print(size) print("\" ")
                
                print("collisionType = static linearDamping = 0.8 angularDamping = 1 ") 
                print("collisiondamage = 1000 enablecollisiondamage = true>")
                
                print("<attached>")
                        print("<Model mass=\"") print(size * 10) print("\" ")
                        print("mesh=\"ast") print(math.mod(i,6) + 1) print(".mesh\" />")
                print("</attached>")
                
                print("<collisionShapes> ")
                        print("<SphereCollisionShape radius=\"") 
                        print(size * 2.5) print("\" />")
                print("</collisionShapes>")
                
                print("</StaticEntity>")
                
                if fog == 1 and i % 5 == 0 then
                        generateFog(pX, pY, pZ, radius*0.04, 0.2)
                end
        end
end


--[[ asteroid belt generator
generates asteroid belt
        posX, posY, posZ - position in space
        yaw, pitch - rotation
        minSize, maxSize - size boundaries of each asteroid
        radius0, radius1 - inner/outer radius
        count - number of asteroids
        fog - enable fog 0/1
--]]
function asteroidBelt(centerX, centerY, centerZ, yaw, pitch, segments, minSize, maxSize, radius0, radius1, count, fog)
        dPhi = (2 * math.pi) / segments
        width = math.abs(radius1 - radius0)
        radius = (radius1 + radius0) / 2
        segmentCount = count / segments
        
        print("<StaticEntity collisionType=static yaw=") print(yaw) 
        print(" pitch=") print(pitch)
        
        print(" position = \"") 
                print(centerX) print(",") 
                print(centerY) print(",") 
                print(centerZ) print("\"") 
        print(">")
        
        print("<attached>")
        
        for i = 0, segments - 1, 1
        do
                asteroidField((radius * math.cos(i * dPhi)),
                                        (radius * math.sin(i * dPhi)),
                                        0, minSize, maxSize, width, segmentCount, fog)
        end
        
        print("</attached>")
        print("</StaticEntity>")
end