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#!/usr/bin/env python
import numpy as np
import pygame
from pygame.locals import *
import layout
from camera import *
from geometry import *
from transform import *
from pycuda import autoinit
from pycuda.compiler import SourceModule
from pycuda import gpuarray
def view(geometry, name=''):
"""
Render `geometry` in a pygame window.
Movement:
- zoom: scroll the mouse wheel
- rotate: click and drag the mouse
- move: shift+click and drag the mouse
"""
lower_bound = np.array([np.min(geometry.mesh[:,:,0]),
np.min(geometry.mesh[:,:,1]),
np.min(geometry.mesh[:,:,2])])
upper_bound = np.array([np.max(geometry.mesh[:,:,0]),
np.max(geometry.mesh[:,:,1]),
np.max(geometry.mesh[:,:,2])])
scale = np.linalg.norm(upper_bound-lower_bound)
print 'device %s' % autoinit.device.name()
source = open(layout.source + '/kernel.cu').read()
module = SourceModule(source, options=['-I' + layout.source], no_extern_c=True, cache_dir=False)
texrefs = geometry.load(module)
cuda_raytrace = module.get_function('ray_trace')
cuda_rotate = module.get_function('rotate')
cuda_translate = module.get_function('translate')
pygame.init()
size = width, height = 800, 600
screen = pygame.display.set_mode(size)
pygame.display.set_caption(name)
camera = Camera(size)
diagonal = np.linalg.norm(upper_bound-lower_bound)
point = np.array([0, diagonal*1.75, (lower_bound[2]+upper_bound[2])/2])
axis1 = np.array([1,0,0], dtype=np.double)
axis2 = np.array([0,0,1], dtype=np.double)
camera.position(point)
origins, directions = camera.get_rays()
origins_float3 = np.empty(origins.shape[0], dtype=gpuarray.vec.float3)
origins_float3['x'] = origins[:,0]
origins_float3['y'] = origins[:,1]
origins_float3['z'] = origins[:,2]
directions_float3 = np.empty(directions.shape[0], dtype=gpuarray.vec.float3)
directions_float3['x'] = directions[:,0]
directions_float3['y'] = directions[:,1]
directions_float3['z'] = directions[:,2]
origins_gpu = cuda.to_device(origins_float3)
directions_gpu = cuda.to_device(directions_float3)
pixels = np.empty(width*height, dtype=np.int32)
pixels_gpu = cuda.to_device(pixels)
nblocks = 64
gpu_kwargs = {'block': (nblocks,1,1), 'grid':(pixels.size/nblocks+1,1)}
def render():
"""Render the mesh and display to screen."""
cuda_raytrace(np.int32(pixels.size), origins_gpu, directions_gpu, np.int32(geometry.node_map.size-1), np.int32(geometry.first_node), pixels_gpu, texrefs=texrefs, **gpu_kwargs)
cuda.Context.synchronize()
cuda.memcpy_dtoh(pixels, pixels_gpu)
pygame.surfarray.blit_array(screen, pixels.reshape(size))
pygame.display.flip()
render()
done = False
clicked = False
shift = False
while not done:
for event in pygame.event.get():
if event.type == MOUSEBUTTONDOWN:
if event.button == 4:
v = scale*np.cross(axis1,axis2)/10.0
cuda_translate(np.int32(pixels.size), origins_gpu, gpuarray.vec.make_float3(*v), **gpu_kwargs)
point += v
render()
if event.button == 5:
v = -scale*np.cross(axis1,axis2)/10.0
cuda_translate(np.int32(pixels.size), origins_gpu, gpuarray.vec.make_float3(*v), **gpu_kwargs)
point += v
render()
if event.button == 1:
clicked = True
mouse_position = pygame.mouse.get_rel()
if event.type == MOUSEBUTTONUP:
if event.button == 1:
clicked = False
if event.type == MOUSEMOTION and clicked:
movement = np.array(pygame.mouse.get_rel())
if (movement == 0).all():
continue
length = np.linalg.norm(movement)
mouse_direction = movement[0]*axis1 + movement[1]*axis2
mouse_direction /= np.linalg.norm(mouse_direction)
if shift:
v = mouse_direction*scale*length/float(width)
cuda_translate(np.int32(pixels.size), origins_gpu, gpuarray.vec.make_float3(*v), **gpu_kwargs)
point += v
render()
else:
phi = np.float32(2*np.pi*length/float(width))
n = rotate(mouse_direction, np.pi/2, \
-np.cross(axis1,axis2))
cuda_rotate(np.int32(pixels.size), origins_gpu, phi, gpuarray.vec.make_float3(*n), **gpu_kwargs)
cuda_rotate(np.int32(pixels.size), directions_gpu, phi, gpuarray.vec.make_float3(*n), **gpu_kwargs)
point = rotate(point, phi, n)
axis1 = rotate(axis1, phi, n)
axis2 = rotate(axis2, phi, n)
render()
if event.type == KEYDOWN:
if event.key == K_LSHIFT or event.key == K_RSHIFT:
shift = True
if event.key == K_ESCAPE:
done = True
break
if event.type == KEYUP:
if event.key == K_LSHIFT or event.key == K_RSHIFT:
shift = False
if __name__ == '__main__':
import os
import sys
import optparse
from stl import *
from materials import *
import detectors
parser = optparse.OptionParser('%prog filename.stl')
parser.add_option('-b', '--bits', type='int', dest='bits',
help='bits for z-ordering space axes', default=8)
options, args = parser.parse_args()
if len(args) < 1:
sys.exit(parser.format_help())
head, tail = os.path.split(args[0])
root, ext = os.path.splitext(tail)
if ext.lower() == '.stl':
geometry = Geometry()
geometry.add_solid(Solid(read_stl(args[0]), vacuum, vacuum))
geometry.build(options.bits)
view(geometry, tail)
else:
import inspect
import chroma.geometry
members = dict(inspect.getmembers(detectors))
if args[0] in members:
if issubclass(members[args[0]], Geometry) or \
issubclass(members[args[0]], chroma.geometry.Geometry):
geometry = members[args[0]]()
geometry.build(options.bits)
view(geometry, args[0])
else:
sys.exit("%s doesn't inherit from a Geometry object" % args[0])
else:
sys.exit("couldn't find a geometry with name %s" % args[0])
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