diff --git a/examples/jsm/loaders/KTX2Loader.js b/examples/jsm/loaders/KTX2Loader.js
index 75e717c100d0d8..6032c6bdda1992 100644
--- a/examples/jsm/loaders/KTX2Loader.js
+++ b/examples/jsm/loaders/KTX2Loader.js
@@ -971,6 +971,8 @@ KTX2Loader.BasisWorker = function () {
 
 const UNCOMPRESSED_FORMATS = new Set( [ RGBAFormat, RGBFormat, RGFormat, RedFormat ] );
 
+const NORMALIZED_VK_FORMATS = new Set( [ VK_FORMAT_R16G16B16A16_UNORM ] );
+
 const FORMAT_MAP = {
 
 	[ VK_FORMAT_R32G32B32A32_SFLOAT ]: RGBAFormat,
@@ -1220,6 +1222,7 @@ async function createRawTexture( container ) {
 		texture.minFilter = useMipmaps ? NearestMipmapNearestFilter : NearestFilter;
 		texture.magFilter = NearestFilter;
 		texture.generateMipmaps = container.levelCount === 0;
+		texture.normalized = NORMALIZED_VK_FORMATS.has( vkFormat );
 
 	} else {
 
diff --git a/src/geometries/SphereGeometry.js b/src/geometries/SphereGeometry.js
index 3fa34b879f7c1e..a0eeed5a540a75 100644
--- a/src/geometries/SphereGeometry.js
+++ b/src/geometries/SphereGeometry.js
@@ -76,6 +76,10 @@ class SphereGeometry extends BufferGeometry {
 			const verticesRow = [];
 
 			const v = iy / heightSegments;
+			const theta = thetaStart + v * thetaLength;
+
+			const y = radius * Math.cos( theta );
+			const ringRadius = Math.sqrt( radius * radius - y * y );
 
 			// special case for the poles
 
@@ -94,12 +98,13 @@ class SphereGeometry extends BufferGeometry {
 			for ( let ix = 0; ix <= widthSegments; ix ++ ) {
 
 				const u = ix / widthSegments;
+				const phi = phiStart + u * phiLength;
 
 				// vertex
 
-				vertex.x = - radius * Math.cos( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
-				vertex.y = radius * Math.cos( thetaStart + v * thetaLength );
-				vertex.z = radius * Math.sin( phiStart + u * phiLength ) * Math.sin( thetaStart + v * thetaLength );
+				vertex.x = - ringRadius * Math.cos( phi );
+				vertex.y = y;
+				vertex.z = ringRadius * Math.sin( phi );
 
 				vertices.push( vertex.x, vertex.y, vertex.z );