In my project using threejs, I am working on creating and rendering a point cloud. One of my goals is to assign each point a specific color based on its Z coordinate. Ideally, I want the color to follow a gradient approach starting from green for the smallest Z values, going through blue, yellow, and finally red for the largest Z values. Can anyone suggest an efficient method to achieve this color mapping for each point?
While my actual script is lengthy, I have condensed it down to these key lines:
function drawCloud(){
for(i = 0; i < totalPoints * 3; i = i + 3){
//Adjusting the Z value for each point
//Z coordinate is every third value, hence i+2
points.geometry.attributes.position.array[i+2] = theNewZValueForThisPoint;
//Assigning colors to points
// R,G, B values are represented by i, i+1, i+2 respectively
//Here, each point is given a green color
points.geometry.attributes.color.array[i] = 0;
points.geometry.attributes.color.array[i+1] = 1;
points.geometry.attributes.color.array[i+2] = 0;
}
}
function animate() {
requestAnimationFrame(animate);
drawCloud();
render();
}
function render() {
renderer.render(scene, camera);
}
Previously, I attempted a segmentation approach where each point was assigned a fixed color within specified ranges. However, this approach resulted in abrupt color transitions between segments. My goal now is to achieve a more gradual gradient change in color as Z values increase.
It's important to note that the code presented here has been simplified for clarity. Any suggestions for enhancements or optimizations would be greatly appreciated.