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PODraw a penetrable object in opengl
 

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  1. PODraw a penetrable object in opengl
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    <p>How to draw a cube which is penetrable using opengl?</p> <pre><code>#include &lt;GL/glut.h&gt; // GLUT, include glu.h and gl.h double rotate_y; double rotate_x; double zoom; void solidSphere(double r) { glutSolidSphere(r, 50, 50); } float ALPHA = 0.6; float trans = 0.1; void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glDisable(GL_TEXTURE_2D); glLoadIdentity(); glTranslatef(-2.2f, 0.31f, -7.0f); glScalef(1.0, 1.0, 1.0); glRotatef(rotate_x, 1.0, 0.0, 0.0 ); glRotatef(rotate_y, 0.0, 1.0, 0.0 ); glColor4f(1,0,0, ALPHA); glutSolidCube(2); glLoadIdentity(); glTranslatef(2.2f - trans, 0.31f, -7.0f); glScalef(1.0, 1.0, 1.0); glColor3f(0,1,0); glutSolidCube(1); glutSwapBuffers(); } // ---------------------------------------------------------- // specialKeys() Callback Function // ---------------------------------------------------------- void specialKeys( int key, int x, int y ) { // Right arrow - increase rotation by 5 degree if (key == GLUT_KEY_RIGHT) trans -= 0.1; // Left arrow - decrease rotation by 5 degree else if (key == GLUT_KEY_LEFT) trans += 0.1; else if (key == GLUT_KEY_UP) rotate_x += 5; else if (key == GLUT_KEY_DOWN) rotate_x -= 5; else if (key == GLUT_KEY_INSERT) zoom *= (1.0 + 0.01); else if (key == GLUT_KEY_END) zoom *= (1.0 - 0.01); // Request display update glutPostRedisplay(); } void reshape(GLsizei width, GLsizei height) { if (height == 0) { height = 1; } GLfloat aspect = (GLfloat)width / (GLfloat)height; glViewport(0, 0, width, height); glOrtho(0.0, width, 0.0, height, 0, 50000); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(90.0f, aspect, 0.1f, 100.0f); } void initGL() { GLfloat sun_direction[] = { 0.0, 2.0, -1.0, 1.0 }; GLfloat sun_intensity[] = { 0.7, 0.7, 0.7, 1.0 }; GLfloat ambient_intensity[] = { 0.3, 0.3, 0.3, 1.0 }; glClearColor(0.1, 0.39, 0.88, 1.0); glColor3f(1.0, 1.0, 1.0); glEnable (GL_BLEND); glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glClearDepth(1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glShadeModel(GL_SMOOTH); glEnable(GL_LIGHTING); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient_intensity); glEnable(GL_LIGHT0); glLightfv(GL_LIGHT0, GL_POSITION, sun_direction); glLightfv(GL_LIGHT0, GL_DIFFUSE, sun_intensity); glEnable(GL_COLOR_MATERIAL); glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); glMatrixMode (GL_PROJECTION); glLoadIdentity (); gluPerspective(90.0f, 2.0, 0.1f, 100.0f); } int main(int argc, char** argv) { rotate_y = 0; rotate_x = 0; zoom = 1.0; glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_DOUBLE| GLUT_RGB | GLUT_DEPTH); glutInitWindowSize(640, 480); glutInitWindowPosition(50, 50); glutCreateWindow("cube and sphere"); glutDisplayFunc(display); glutReshapeFunc(reshape); glutSpecialFunc(specialKeys); initGL(); glutMainLoop(); return 0; } </code></pre> <p>this code will draw two cubes one partial transparent and one completely opaque By right and left arrow key you can move green cube. I need that when green cube enters red cube(transparent) part of cube inside is also visible</p> <p>is it feasible ?</p>
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    1. USlearner
    1. USlearner
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    1. COUse alpha values for transparency and making objects penetrable isn't really an OpenGL thing, making an object penetrable is something you need to handle through calculating collision detection.
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      1. USVallentin
    2. CO@Vallentin thanks can you provide some code for alpha values?
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      1. PODraw a penetrable object in opengl
      1. USlearner
    3. COpossible duplicate of [Drawing a solid sphere with transparency in openGL](http://stackoverflow.com/questions/4451399/drawing-a-solid-sphere-with-transparency-in-opengl)
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      1. PODraw a penetrable object in opengl
      1. USRoger Rowland
 

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