WorldViz User Forum - About intersect function

Unfortunately the current version of the InfiniteTerrain plugin does not work with the intersect function. If you were to supply your own terrain generation function to the plugin, then you would be able to determine the height of the terrain at any given (x,z) coordinate. Here is a sample script showing how to use your own function to generate the terrain:

Code:

import viz

import math

viz.go()



#Add a skybox

sky = viz.add('skydome.dlc')

env = viz.add(viz.ENVIRONMENT_MAP,'sky.jpg')

sky.texture(env)

sky.disable(viz.FOG)



grass = viz.add('grass.jpg')



#Need to set texture mode to repeat for terrain texture

grass.wrap(viz.WRAP_S,viz.REPEAT)

grass.wrap(viz.WRAP_T,viz.REPEAT)



# Initialize random number generator with string '456'

# Set tesselation level to 7 (default is 6) Smaller value means less detail, faster rendering

# Set texture repeat level to 6 (default is 4)

# Set viewing distance to 15000 (default is 4096)

# Set LOD factor to 0.0005 (default is 0.001) Smaller numbers mean LOD changes further away, 

# (i.e 'popping' will be less noticeable)

#terrain = viz.add('InfiniteTerrain.dlc',1,'456',7,6,15000,0.0005)

terrain = viz.add('InfiniteTerrain.dlc',1,'456',4,4,15000,0.0001)

terrain.texture(grass)



#Set heightscale1 to 150

#Set heightscale2 to 5

#Height scales are used for generating terrain height

#Formula = heightscale1 * random() + heightscale2 * random();

terrain.command(1,'',150,5)





# Large a, steep curve

# http://astronomy.swin.edu.au/~pbourke/analysis/sigmoid/

def sigmoid(x, a):

        y = 1.0 / ( 1 + math.exp(-a * x))

        return y







def sumsines(theta, periods):

        sum = 0.0

        for p in periods:

                sum += math.sin(theta/p)

        return sum

        

p1 = [500, 1000]

p2 = [500, 1000]



def terrainfunc(x,z):

        #Input: x,z position of terrain

        #Output: height of terrain at that position

        

        height = (sumsines(x,p1) + sumsines(z,p2) +5) * 100

        

        distance = abs(x - math.sin(z/1500)*850) 

        weight = sigmoid(distance - 800, .006)                

        

        return height * weight



#Use the python function 'terrainfunc' instead of builtin random height generator

terrain.command(3,'terrainfunc')



#Hide ground plane

terrain.command(5)



#Create fog

viz.fogcolor(0.784,0.867,0.941)

viz.fog(0.00007,-1)



#Create static lighting

light = viz.add(viz.LIGHT)

light.position(-0.5,0.4,0.5,0)

light.enable()

viz.get(viz.HEAD_LIGHT).disable()



#Crank up sensitivity

viz.sensitivity(1000,1)