N6610 LCD 3D Demo

Nokia 6610/6100 LCD 3D projections demo using Microchip's PIC18F25J11.
PIC18F25J11 is clocked at 12MHz external oscillator with 4xPLL enabled.
It's operated at 3.3V supply, same with the LCD (and so, direct connections and higher spi clock rates are possible).





The demo is all about simple 3D projection - no rendering, no raycasting, etc., just the plotting of edges/lines. It displays common polyhedrons like tetrahedron, hexahedron(cube), octahedron, square pyramid, and triangular prism.




"3Ddemo.c"


/***** Draw 3D object with given vertices, edges and angles of rotation******/<br />void draw_3D(Vertex * V, Edge * E, nVertices, nEdges, xRot, yRot, zRot)<br />{<br /> u8 i;<br /> float tempX,tempY,tempZ; // temporary coordinates<br /> float sinX,sinY,sinZ,cosX,cosY,cosZ; // precomputed sin and cos values<br /> float px,py,pz; // projected<br /><br /> // sin and cos values<br /> sinX = sin_table( xRot ) / 255.0;<br /> sinY = sin_table( yRot ) / 255.0;<br /> sinZ = sin_table( zRot ) / 255.0;<br /><br /> cosX = cos_table( xRot ) / 255.0;<br /> cosY = cos_table( yRot ) / 255.0;<br /> cosZ = cos_table( zRot ) / 255.0;<br /><br /> // calculate the new coordinates of points<br /> for (i=0; i< nVertices; i++)<br /> {<br /> tempX = V[i].x;<br /> tempY = V[i].y;<br /> tempZ = V[i].z;<br /><br /> // store previous coordinates<br /> old_points[i] = new_points[i];<br /><br /> // rotation on X axis<br /> py = tempY * cosX - tempZ * sinX;<br /> pz = tempY * sinX + tempZ * cosX;<br /> tempY =py; tempZ = pz;<br /><br /> // rotation on Z axis<br /> px = tempX * cosZ - tempY * sinZ;<br /> py = tempX * sinZ + tempY * cosZ;<br /> tempX = px; tempY = py;<br /><br /> // rotation on Y axis<br /> px = tempX * cosY - tempZ * sinY;<br /> pz = tempX * sinY + tempZ * cosY;<br /><br /> // save the screen coordinates<br /> new_points[i].x = (u8)px * SCALE_FACTOR + OFFSETX;<br /> new_points[i].y = (u8)py * SCALE_FACTOR + OFFSETY;<br /> }<br /><br /> // lcd plot<br /> for (i=0; i< nEdges; i++)<br /> {<br /> // erase old edges<br /> drawline(<br /> old_points[E[i].start].x, old_points[E[i].start].y,<br /> old_points[E[i].end].x, old_points[E[i].end].y,<br /> BG_COLOR);<br /> // draw new edges<br /> drawline(<br /> new_points[E[i].start].x, new_points[E[i].start].y,<br /> new_points[E[i].end].x, new_points[E[i].end].y,<br /> LINE_COLOR);<br /><br /> }<br />


*based on original sources:

Nokia 6100 LCD with CCS C


3D Vector objects in C using the PIC micro



Microchip C18 project:  n6610lcd_3D_demo.zip