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Add SpriteMaterial sizeAttenuation property #14636

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Merged
merged 2 commits into from
Aug 14, 2018
Merged

Add SpriteMaterial sizeAttenuation property #14636

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44db10a
Add sizeAttenuation property
WestLangley Aug 4, 2018
eabbd39
Size attenuation flag applies to perspective projection only
WestLangley Aug 7, 2018
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5 changes: 4 additions & 1 deletion docs/api/materials/SpriteMaterial.html
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Expand Up @@ -67,8 +67,11 @@ <h3>[property:Texture map]</h3>
<h3>[property:Radians rotation]</h3>
<p>The rotation of the sprite in radians. Default is 0.</p>

<h3>[property:Boolean sizeAttenuation]</h3>
<p>Whether the size of the sprite is attenuated by the camera depth. (Perspective camera only.) Default is *true*.</p>

<h2>Methods</h2>
<p>See the base [page:Material] class for common methods.</p>
<p>See the base [page:Material] class for common methods.</p>

<h2>Source</h2>

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10 changes: 6 additions & 4 deletions src/materials/SpriteMaterial.js
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Expand Up @@ -6,11 +6,9 @@ import { Color } from '../math/Color.js';
*
* parameters = {
* color: <hex>,
* opacity: <float>,
* map: new THREE.Texture( <Image> ),
*
* uvOffset: new THREE.Vector2(),
* uvScale: new THREE.Vector2()
* rotation: <float>,
* sizeAttenuation: <bool>
* }
*/

Expand All @@ -25,6 +23,8 @@ function SpriteMaterial( parameters ) {

this.rotation = 0;

this.sizeAttenuation = true;

this.lights = false;
this.transparent = true;

Expand All @@ -45,6 +45,8 @@ SpriteMaterial.prototype.copy = function ( source ) {

this.rotation = source.rotation;

this.sizeAttenuation = source.sizeAttenuation;

return this;

};
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13 changes: 10 additions & 3 deletions src/renderers/shaders/ShaderLib/sprite_vert.glsl
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Expand Up @@ -11,19 +11,26 @@ void main() {

#include <uv_vertex>

vec4 mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );

vec2 scale;
scale.x = length( vec3( modelMatrix[ 0 ].x, modelMatrix[ 0 ].y, modelMatrix[ 0 ].z ) );
scale.y = length( vec3( modelMatrix[ 1 ].x, modelMatrix[ 1 ].y, modelMatrix[ 1 ].z ) );

#ifndef USE_SIZEATTENUATION

bool isPerspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 );

if ( isPerspective ) scale *= - mvPosition.z;

#endif

vec2 alignedPosition = ( position.xy - ( center - vec2( 0.5 ) ) ) * scale;

vec2 rotatedPosition;
rotatedPosition.x = cos( rotation ) * alignedPosition.x - sin( rotation ) * alignedPosition.y;
rotatedPosition.y = sin( rotation ) * alignedPosition.x + cos( rotation ) * alignedPosition.y;

vec4 mvPosition;

mvPosition = modelViewMatrix * vec4( 0.0, 0.0, 0.0, 1.0 );
mvPosition.xy += rotatedPosition;

gl_Position = projectionMatrix * mvPosition;
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