Variable Transparency

You can set the transparency individually for each point in a point cloud by specifing an existing scalar quantity to serve as the transparency. This can also be set manually in the GUI via the point cloud [Options] --> [Variable Transparency] setting.

See the transparency section for more transparency-related options.

Example:

#include "polyscope/point_cloud.h"

// Populate a random scalar quantity
std::vector<double> xC(points.size());
for (size_t i = 0; i < points.size(); i++) {
  xC[i] = points[i].x;
}

// Get a reference to some point cloud
auto psCloud = polyscope::getPointCloud(/* your point cloud name */);

auto q = psCloud->addScalarQuantity("xC", xC); // add the quantity
psCloud->setTransparencyQuantity(q); // set the quantity as the radius
// psCloud->setTransparencyQuantity("xC"); // equivalently, the name can be used

All values will be clamped into the [0,1] range. The transparency is multiplicative with any other transparency effects, such as setting the structure’s global transparency value.

void PointCloud::setTransparencyQuantity(PointCloudScalarQuantity* quantity)

set transparency quantity

Set the transparency quantity. All values will be clamped into the [0,1] range.

If transparency is not already enabled, updates the transparency mode to be Pretty.

void PointCloud::setTransparencyQuantity(std::string name)

Set the transparency quantity by name. All values will be clamped into the [0,1] range.

If transparency is not already enabled, updates the transparency mode to be Pretty.

void PointCloud::clearTransparencyQuantity()

clear transparency quantity

Clear the transparency quantity.