78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
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'''
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3D Rotating Monkey Head
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========================
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This example demonstrates using OpenGL to display a rotating monkey head. This
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includes loading a Blender OBJ file, shaders written in OpenGL's Shading
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Language (GLSL), and using scheduled callbacks.
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The monkey.obj file is an OBJ file output from the Blender free 3D creation
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software. The file is text, listing vertices and faces and is loaded
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using a class in the file objloader.py. The file simple.glsl is
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a simple vertex and fragment shader written in GLSL.
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'''
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from kivy.app import App
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from kivy.clock import Clock
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from kivy.core.window import Window
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from kivy.uix.widget import Widget
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from kivy.resources import resource_find
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from kivy.graphics.transformation import Matrix
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from kivy.graphics.opengl import glEnable, glDisable, GL_DEPTH_TEST
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from kivy.graphics import RenderContext, Callback, PushMatrix, PopMatrix, \
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Color, Translate, Rotate, Mesh, UpdateNormalMatrix
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from objloader import ObjFile
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class Renderer(Widget):
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def __init__(self, **kwargs):
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self.canvas = RenderContext(compute_normal_mat=True)
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self.canvas.shader.source = resource_find('simple.glsl')
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self.scene = ObjFile(resource_find("monkey.obj"))
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super(Renderer, self).__init__(**kwargs)
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with self.canvas:
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self.cb = Callback(self.setup_gl_context)
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PushMatrix()
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self.setup_scene()
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PopMatrix()
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self.cb = Callback(self.reset_gl_context)
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Clock.schedule_interval(self.update_glsl, 1 / 60.)
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def setup_gl_context(self, *args):
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glEnable(GL_DEPTH_TEST)
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def reset_gl_context(self, *args):
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glDisable(GL_DEPTH_TEST)
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def update_glsl(self, delta):
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asp = self.width / float(self.height)
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proj = Matrix().view_clip(-asp, asp, -1, 1, 1, 100, 1)
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self.canvas['projection_mat'] = proj
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self.canvas['diffuse_light'] = (1.0, 1.0, 0.8)
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self.canvas['ambient_light'] = (0.1, 0.1, 0.1)
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self.rot.angle += delta * 100
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def setup_scene(self):
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Color(1, 1, 1, 1)
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PushMatrix()
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Translate(0, 0, -3)
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self.rot = Rotate(1, 0, 1, 0)
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m = list(self.scene.objects.values())[0]
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UpdateNormalMatrix()
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self.mesh = Mesh(
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vertices=m.vertices,
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indices=m.indices,
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fmt=m.vertex_format,
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mode='triangles',
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)
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PopMatrix()
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class RendererApp(App):
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def build(self):
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return Renderer()
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if __name__ == "__main__":
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RendererApp().run()
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