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copied!<p>I worked on a OpenFramworks code that subdived the image in parts, <a href="https://github.com/fishkingsin/ofxRenderManager/blob/master/src/ofTextureAdv.cpp" rel="nofollow noreferrer">adapted from here</a>:</p> <pre><code>//----------------------------------------- setup #define GRID_X 8 #define GRID_Y 8 float * compL = new float[GRID_Y]; float * compR = new float[GRID_Y]; memset(compL, 0, GRID_Y * sizeof(float)); memset(compR, 0, GRID_Y * sizeof(float)); ofPoint * grid = new ofPoint[GRID_X * GRID_Y]; ofPoint * coor = new ofPoint[GRID_X * GRID_Y]; int width = imageGrid.width; int height = imageGrid.height; ofPoint quad[4]; ofPoint utQuad[4]; //----------------------------------------- update quad[0].set(0,0,0); quad[1].set(width,0,0); quad[2].set(mouseX,mouseY,0); quad[3].set(0,height,0); utQuad[0].set(0,0,0); utQuad[1].set(1,0,0); utQuad[2].set(1,1,0); utQuad[3].set(0,1,0); int gridSizeX = GRID_X; int gridSizeY = GRID_Y; float xRes = 1.0/(gridSizeX-1); float yRes = 1.0/(gridSizeY-1); for(int y = 0; y < gridSizeY; y++){ for(int x = 0; x < gridSizeX; x++){ int index = y*gridSizeX + x; float pctx = (float)x * xRes; float pcty = (float)y * yRes; float pctyL = pcty + yRes*compL[y]; float pctyR = pcty + yRes*compR[y]; float linePt0x = (1-pctyL)*quad[0].x + pctyL * quad[3].x; float linePt0y = (1-pctyL)*quad[0].y + pctyL * quad[3].y; float linePt1x = (1-pctyR)*quad[1].x + pctyR * quad[2].x; float linePt1y = (1-pctyR)*quad[1].y + pctyR * quad[2].y; float ptx = (1-pctx) * linePt0x + pctx * linePt1x; float pty = (1-pctx) * linePt0y + pctx * linePt1y; float utPt0x = (1-pcty)*utQuad[0].x + pcty * utQuad[3].x; float utPt0y = (1-pcty)*utQuad[0].y + pcty * utQuad[3].y; float utPt1x = (1-pcty)*utQuad[1].x + pcty * utQuad[2].x; float utPt1y = (1-pcty)*utQuad[1].y + pcty * utQuad[2].y; float tt = (1-pctx) * utPt0x + pctx * utPt1x; float uu = (1-pctx) * utPt0y + pctx * utPt1y; grid[index].set(ptx, pty, 0); coor[index].set( (tt * imageGrid.getTextureReference().texData.tex_t), imageGrid.getTextureReference().texData.bFlipTexture ? imageGrid.getTextureReference().texData.tex_u - (uu * imageGrid.getTextureReference().texData.tex_u) : (uu * imageGrid.getTextureReference().texData.tex_u), 0); } } //----------------------------------------- draw ofSetColor(255, 255, 255); ofFill(); glEnable(imageGrid.getTextureReference().texData.textureTarget); glBindTexture( imageGrid.getTextureReference().texData.textureTarget, (GLuint)imageGrid.getTextureReference().texData.textureID); for(int y = 0; y < gridSizeY-1; y++){ for(int x = 0; x < gridSizeX-1; x++){ glBegin(GL_QUADS); int pt0 = x + y*gridSizeX; int pt1 = (x+1) + y*gridSizeX; int pt2 = (x+1) + (y+1)*gridSizeX; int pt3 = x + (y+1)*gridSizeX; glTexCoord2f(coor[pt0].x, coor[pt0].y); glVertex2f( grid[pt0].x, grid[pt0].y); glTexCoord2f(coor[pt1].x, coor[pt1].y); glVertex2f( grid[pt1].x, grid[pt1].y); glTexCoord2f(coor[pt2].x, coor[pt2].y); glVertex2f( grid[pt2].x, grid[pt2].y); glTexCoord2f(coor[pt3].x, coor[pt3].y); glVertex2f( grid[pt3].x, grid[pt3].y); glEnd(); } } glDisable(imageGrid.getTextureReference().texData.textureTarget); //Draw grid ofSetColor(255, 0, 0); ofNoFill(); for(int y = 0; y < gridSizeY-1; y++){ for(int x = 0; x < gridSizeX-1; x++){ glBegin(GL_LINE_LOOP); int pt0 = x + y*gridSizeX; int pt1 = (x+1) + y*gridSizeX; int pt2 = (x+1) + (y+1)*gridSizeX; int pt3 = x + (y+1)*gridSizeX; glVertex2f( grid[pt0].x, grid[pt0].y); glVertex2f( grid[pt1].x, grid[pt1].y); glVertex2f( grid[pt2].x, grid[pt2].y); glVertex2f( grid[pt3].x, grid[pt3].y); glEnd(); } } </code></pre> <p>The result is awesome:</p> <p><img src="https://i.stack.imgur.com/LaLgB.png" alt="Result"></p>

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