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POrotating model while color updating
 

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  1. POrotating model while color updating
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    <p>In OpenGL, I draw tree(composed of lines) like structure(neurons), and based on activity, i apply a color on each of the branches of the tree. Each branch portion may have a different color at an instance. I keep record of the color at an instance corresponding to the branch. </p> <p>I am able to rotate (by changing the modelview matrix) the tree. I can see the changing color (activity) on the branches when updating. </p> <p>However, i am not able to rotate the tree while the color change is happening. (the rotation is seen after the complete updating) This is also true with translating the model, not able to translate while updating. </p> <p>How should i be doing this to see them simultaneously? </p> <p>i call the updateViz function to update the colors. </p> <pre><code>def render(self): glMatrixMode(GL_MODELVIEW) glLoadIdentity() self.renderAxis() #draws 3 axes at origin for obj in self.vizObjects: glPushMatrix() glColor(obj.r, obj.g, obj.b) glLineWidth(2) glBegin(GL_LINES) glVertex3f(obj.l_coords[0],obj.l_coords[1],obj.l_coords[2]) glVertex3f(obj.l_coords[3],obj.l_coords[4],obj.l_coords[5]) glEnd() glPopMatrix() def updateViz(self,vals): inds = digitize(vals,colrMapVals) for i in range(0,len(self.vizObjects)): self.vizObjects[i].r,self.vizObjects[i].g,self.vizObjects[i].b= colorMap[inds[i]-1] def translate(self, _trans): self.makeCurrent() glMatrixMode(GL_MODELVIEW) glLoadIdentity() glTranslated(_trans[0], _trans[1], _trans[2]) glMultMatrixd(self.modelview_matrix_) self.modelview_matrix_ = glGetDoublev(GL_MODELVIEW_MATRIX) self.translate_vector_[0] = self.modelview_matrix_[3][0] self.translate_vector_[1] = self.modelview_matrix_[3][1] self.translate_vector_[2] = self.modelview_matrix_[3][2] def rotate(self, _axis, _angle): #self.modelview_matrix_ = glGetDoublev(GL_MODELVIEW_MATRIX) t = [self.modelview_matrix_[0][0] * self.center_[0] + self.modelview_matrix_[1][0] * self.center_[1] + self.modelview_matrix_[2][0] * self.center_[2] + self.modelview_matrix_[3][0], self.modelview_matrix_[0][1] * self.center_[0] + self.modelview_matrix_[1][1] * self.center_[1] + self.modelview_matrix_[2][1] * self.center_[2] + self.modelview_matrix_[3][1], self.modelview_matrix_[0][2] * self.center_[0] + self.modelview_matrix_[1][2] * self.center_[1] + self.modelview_matrix_[2][2] * self.center_[2] + self.modelview_matrix_[3][2]] self.makeCurrent() glLoadIdentity() glTranslatef(t[0], t[1], t[2]) glRotated(_angle, _axis[0], _axis[1], _axis[2]) glTranslatef(-t[0], -t[1], -t[2]) glMultMatrixd(self.modelview_matrix_) self.modelview_matrix_ = glGetDoublev(GL_MODELVIEW_MATRIX) def keyPressEvent(self, ev): if (ev.key() == QtCore.Qt.Key_Left): self.translate([-0.25, 0.0, 0.0]) self.updateGL() elif (ev.key() == QtCore.Qt.Key_Right): self.translate([0.25, 0.0, 0.0]) self.updateGL() elif (ev.key() == QtCore.Qt.Key_A): self.rotate([1.0, 0.0, 0.0],2.0) self.updateGL() elif (ev.key() == QtCore.Qt.Key_Q): self.rotate([1.0, 0.0, 0.0],-2.0) self.updateGL() </code></pre> <p>I use PyQt4 and PyGLWidget</p>
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    1. USchaitu
    1. USchaitu
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    1. This table or related slice is empty.
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    1. COWhere's the rotation? There are no matrix operations in the code above, other than mode-setting and identity.
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      1. POrotating model while color updating
      1. USMarcelo Cantos
    2. COjust added the code
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      1. POrotating model while color updating
      1. USchaitu
 

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