To Check out our forum post to learn how to programmatically create standard views for CAD models in PDF,
Get the bounding box of the model and calculate the camera center point.
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//To get the camera center
A3DBoundingBoxData pboxdata;
A3D_INITIALIZE_DATA(A3DBoundingBoxData, pboxdata);
A3DMiscComputeBoundingBox(pModelFile, 0, &pboxdata);
double centerx, centery, centerz;
centerx = (pboxdata.m_sMax.m_dX + pboxdata.m_sMin.m_dX) / 2;
centery = (pboxdata.m_sMax.m_dY + pboxdata.m_sMin.m_dY) / 2;
centerz = (pboxdata.m_sMax.m_dZ + pboxdata.m_sMin.m_dZ) / 2; |
2. The position of the camera is a point that represents the position of the viewpoint. Normally, the camera position is placed slightly away from the objects that you wish to view
More informtion for the Camera definition https://docs.techsoft3d.com/publish/latest/guide/authoring/defining_3d.html#camera-definition
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//To compute the position that slighlty aways
double highestValue = centerz;
double pboxdataMax = pboxdata.m_sMax.m_dZ;
double pboxdataMin = pboxdata.m_sMin.m_dZ;
if (highestValue < centerx)
{
highestValue = centerx;
pboxdataMax = pboxdata.m_sMax.m_dX;
pboxdataMin = pboxdata.m_sMin.m_dX;
}
if (highestValue < centery)
{
highestValue = centery;
pboxdataMax = pboxdata.m_sMax.m_dY;
pboxdataMin = pboxdata.m_sMin.m_dY;
}
double maxFactor = (pboxdataMax - highestValue) * 5;
double minFactor = (pboxdataMin - highestValue) * 5; |
3. Finally, we can create standard views (Right, Left, Top, Bottom, Front, Back and Iso)
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// creating the views
A3DPDFView* pViewDef;
A3DPDFView* pViews[6]; memset(pViews, 0, 4 * sizeof(A3DPDFView*));
A3DUTF8Char viewnameDef[] = "Right View";
const A3DUTF8Char* viewnames[6] = { "Left View", "Top View","Bottom View", "Front View", "Back View", "ISO view" };
// Right View
CHECK_RET(CreateView(pDoc, p3DArtwork,
pboxdata.m_sMax.m_dX + maxFactor, centery, centerz, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
true, viewnameDef, &pViewDef));
// Left View
CHECK_RET(CreateView(pDoc, p3DArtwork,
pboxdata.m_sMin.m_dX + minFactor, centery, centerz, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[0], &pViews[0]));
// Top View
CHECK_RET(CreateView(pDoc, p3DArtwork,
centerx, centery, pboxdata.m_sMax.m_dZ + maxFactor, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[1], &pViews[1]));
// Bottom View
CHECK_RET(CreateView(pDoc, p3DArtwork,
centerx, centery, pboxdata.m_sMin.m_dZ + minFactor, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[2], &pViews[2]));
// Front View
CHECK_RET(CreateView(pDoc, p3DArtwork,
centerx, pboxdata.m_sMin.m_dY + minFactor, centerz, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[3], &pViews[3]));
// Back View
CHECK_RET(CreateView(pDoc, p3DArtwork,
centerx, pboxdata.m_sMax.m_dY + maxFactor, centerz, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[4], &pViews[4]));
// ISO View
CHECK_RET(CreateView(pDoc, p3DArtwork,
pboxdata.m_sMax.m_dX + maxFactor, pboxdata.m_sMax.m_dY + maxFactor, pboxdata.m_sMax.m_dZ + maxFactor, // camera position
centerx, centery, centerz, // target position
0, 0, 0, // up vector unused - roll is used instead
0, // roll
kA3DPDFPerspectiveMode, 0, 30,
false, viewnames[5], &pViews[5])); |
4. You may adjust the values to find the best fitting for your usage.