Add modelview and normalview matrices

src/renderers/WebGLRenderer.js

@@ -1464,8 +1464,16 @@ function WebGLRenderer( parameters ) {
 		object.onBeforeRender( _this, scene, camera, geometry, material, group );
 		currentRenderState = renderStates.get( scene, _currentArrayCamera || camera );
 
-		object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
-		object.normalMatrix.getNormalMatrix( object.modelViewMatrix );
+		if ( multiview.isEnabled() ) {
+
+			multiview.computeObjectMatrices( object, camera );
+
+		} else {
+
+			object.modelViewMatrix.multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
+			object.normalMatrix.getNormalMatrix( object.modelViewMatrix );
+
+		}
 
 		if ( object.isImmediateRenderObject ) {
 
@@ -2016,8 +2024,18 @@ function WebGLRenderer( parameters ) {
 
 		// common matrices
 
-		p_uniforms.setValue( _gl, 'modelViewMatrix', object.modelViewMatrix );
-		p_uniforms.setValue( _gl, 'normalMatrix', object.normalMatrix );
+		if ( material.supportsMultiview && multiview.isEnabled() ) {
+
+			p_uniforms.setValue( _gl, 'modelViewMatrices', object.modelViewMatrices );
+			p_uniforms.setValue( _gl, 'normalMatrices', object.normalMatrices );
+
+		} else {
+
+			p_uniforms.setValue( _gl, 'modelViewMatrix', object.modelViewMatrix );
+			p_uniforms.setValue( _gl, 'normalMatrix', object.normalMatrix );
+
+		}
+
 		p_uniforms.setValue( _gl, 'modelMatrix', object.matrixWorld );
 
 		return program;

src/renderers/webgl/WebGLMultiview.js

@@ -3,6 +3,8 @@
  */
 
 import { WebGLRenderTarget } from '../WebGLRenderTarget.js';
+import { Matrix3 } from '../../math/Matrix3.js';
+import { Matrix4 } from '../../math/Matrix4.js';
 
 function WebGLMultiview( requested, gl, canvas, extensions, capabilities, properties ) {
 
@@ -24,7 +26,6 @@ function WebGLMultiview( requested, gl, canvas, extensions, capabilities, proper
 
 	};
 
-
 	if ( requested && ! this.isAvailable() ) {
 
 		console.warn( 'WebGLRenderer: Multiview requested but not supported by the browser' );
@@ -46,6 +47,47 @@ function WebGLMultiview( requested, gl, canvas, extensions, capabilities, proper
 		depthStencil: null
 	};
 
+	this.computeObjectMatrices = function ( object, camera ) {
+
+		if ( ! object.modelViewMatrices ) {
+
+			object.modelViewMatrices = new Array( numViews );
+			object.normalMatrices = new Array( numViews );
+
+			for ( var i = 0; i < numViews; i ++ ) {
+
+				object.modelViewMatrices[ i ] = new Matrix4();
+				object.normalMatrices[ i ] = new Matrix3();
+
+			}
+
+		}
+
+		if ( camera.isArrayCamera ) {
+
+			for ( var i = 0; i < numViews; i ++ ) {
+
+				object.modelViewMatrices[ i ].multiplyMatrices( camera.cameras[ i ].matrixWorldInverse, object.matrixWorld );
+				object.normalMatrices[ i ].getNormalMatrix( object.modelViewMatrices[ i ] );
+
+			}
+
+		} else {
+
+			// In this case we still need to provide an array of matrices but just the first one will be used
+			object.modelViewMatrices[ 0 ].multiplyMatrices( camera.matrixWorldInverse, object.matrixWorld );
+			object.normalMatrices[ 0 ].getNormalMatrix( object.modelViewMatrices[ 0 ] );
+
+			for ( var i = 0; i < numViews; i ++ ) {
+
+				object.modelViewMatrices[ i ].copy( object.modelViewMatrices[ 0 ] );
+				object.normalMatrices[ i ].copy( object.normalMatrices[ 0 ] );
+
+			}
+
+		}
+
+	};
 
 	// @todo Get ArrayCamera
 	this.createMultiviewRenderTargetTexture = function () {

src/renderers/webgl/WebGLProgram.js

@@ -414,11 +414,13 @@ function WebGLProgram( renderer, extensions, code, material, shader, parameters,
 			'uniform vec3 cameraPosition;',
 
 			material.supportsMultiview && renderer.multiview.isEnabled() ? [
-				'uniform mat4 modelViewMatrix;',
-				'uniform mat3 normalMatrix;',
+				'uniform mat4 modelViewMatrices[2];',
+				'uniform mat3 normalMatrices[2];',
 				'uniform mat4 viewMatrices[2];',
 				'uniform mat4 projectionMatrices[2];',
 
+				'#define modelViewMatrix modelViewMatrices[VIEW_ID]',
+				'#define normalMatrix normalMatrices[VIEW_ID]',
 				'#define viewMatrix viewMatrices[VIEW_ID]',
 				'#define projectionMatrix projectionMatrices[VIEW_ID]'