I've been on a journey to discover how to implement a magnifying glass effect that tracks the mouse and enlarges elements within a scene. Imagine something similar to a rifle scope. Any suggestions on how to begin this project?
I've been on a journey to discover how to implement a magnifying glass effect that tracks the mouse and enlarges elements within a scene. Imagine something similar to a rifle scope. Any suggestions on how to begin this project?
As I pondered the question, a solution presented itself to me. Although it may not be the exact babylon.js solution I sought, it still serves its purpose well. By utilizing divs and jquery, I was able to create a magnification effect on the source image used as a material on a plane within a 3D space. The key lies in the 'overtarget' function where the mouse position over the target is translated into a percentage of the image's dimensions, allowing for precise movement of the magnified div inside the glass based on that percentage. I incorporated PHP to retrieve the image from a database and calculate its size, aligning with the structure of my project. However, you can begin with any image and manually input the height and width values.
For a demonstration, you can visit:
I believe this technique could prove valuable to someone exploring applications such as using it as a rifle scope in a game or similar scenarios.
<?php
$studyID= $_GET['studyID'];
$myServer = "[your server]";
$myUser = "[you]";
$myPass = "[password]";
$myDB = "[db]";
$dbhandle = mssql_connect($myServer, $myUser, $myPass) or die("Couldn't connect to SQL Server on $myServer");
$selected = mssql_select_db($myDB, $dbhandle) or die("Couldn't open database $myDB");
$query = "SELECT * FROM [your table] WHERE id=".$studyID;
$result = mssql_query($query);
$numRows = mssql_num_rows($result);
while($row = mssql_fetch_array($result)) {
$imageFile= $row["imageFile"];
$mag= $row["mag"];
}
mssql_close($dbhandle);
$size = getimagesize($imageFile);
$ht=$size[1];
$wd=$size[0];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
[...]
</script>
</head>
<body>
<canvas id="renderCanvas"></canvas>
<div id="glass"><img id="targetImg" src=""/></div>
<div id="legend">T=forward<BR />B=back<BR />F=left<BR />H=right</div>
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