Greatly improve shading model

- Directional toon lighting component on entities. (extension of the
shadow light source)
The shadows were doing this anyways, but with extremely bad
stairstepping. Now it smoothly blends into the shadow.
- Greatly reduce shadow acne via the above and a larger bias.
- Respect culling mode for each model.
- Two sided shading for course models.
- Disable alpha for water that does not use it.
- Only GBA Sky Garden's skybox receives shadows now.
- Custom light positions for some maps. (you can guess which)

code/entities/decorations.js

@@ -31,6 +31,7 @@ window.ObjDecor = function(obji, scene) {
 	var animMat = null;
 
 	function draw(view, pMatrix) {
+		if (forceBill) nitroRender.setShadBias(0.001);
 		mat4.translate(mat, view, t.pos);
 				
 		if (t.angle[2] != 0) mat4.rotateZ(mat, mat, t.angle[2]*(Math.PI/180));
@@ -39,6 +40,7 @@ window.ObjDecor = function(obji, scene) {
 		
 		mat4.scale(mat, mat, vec3.scale([], t.scale, 16));
 		res.mdl[0].draw(mat, pMatrix, animMat);
+		if (forceBill) nitroRender.resetShadOff();
 	}
 
 	function update() {

code/entities/kart.js

@@ -322,9 +322,9 @@ window.Kart = function(pos, angle, speed, kartN, charN, controller, scene) {
 		k.items.update(input);
 
 		if (input.turn > 0.3) {
-			if (k.driveAnimF < 28) k.driveAnimF++;
-		} else if (input.turn < -0.3) {
 			if (k.driveAnimF > 0) k.driveAnimF--;
+		} else if (input.turn < -0.3) {
+			if (k.driveAnimF < 28) k.driveAnimF++;
 		} else {
 			if (k.driveAnimF > 14) k.driveAnimF--;
 			else if (k.driveAnimF < 14) k.driveAnimF++;
@@ -725,8 +725,7 @@ window.Kart = function(pos, angle, speed, kartN, charN, controller, scene) {
 			}
 			var velSeg = vec3.clone(baseVel);
 			if (k.kartColTimer > 0) {
-				vec3.scale([], k.kartColVel, k.kartColTimer/COLBOUNCE_TIME);
-				vec3.add(velSeg, velSeg, k.kartColVel);
+				vec3.add(velSeg, velSeg, vec3.scale([], k.kartColVel, k.kartColTimer/COLBOUNCE_TIME));
 			}
 			var posSeg = vec3.clone(k.pos);
 			var ignoreList = [];
@@ -1046,7 +1045,7 @@ window.Kart = function(pos, angle, speed, kartN, charN, controller, scene) {
 		//order y, x, z
 		var dir = k.physicalDir+k.driftOff+(Math.sin((COLBOUNCE_TIME-k.kartColTimer)/3)*(Math.PI/6)*(k.kartColTimer/COLBOUNCE_TIME));
 		var forward = [Math.sin(dir), 0, -Math.cos(dir)];
-		var side = [Math.cos(dir), 0, Math.sin(dir)];
+		var side = [-Math.cos(dir), 0, -Math.sin(dir)];
 		if (k.physBasis != null) {
 			vec3.transformMat4(forward, forward, k.physBasis.mat);
 			vec3.transformMat4(side, side, k.physBasis.mat);

code/entities/water.js

@@ -27,6 +27,7 @@ window.ObjWater = function(obji, scene) {
 	var wosc = 12.288;
 	var wstay = 5*60;
 	var wchange = 4*60;
+	var useAlpha = true; //probably a crutch - this should be defined in the water material (though it might be in nsbma)
 
 	function draw(view, pMatrix) {
 		if (nitroRender.flagShadow) return;
@@ -41,7 +42,7 @@ window.ObjWater = function(obji, scene) {
 		var height = (t.pos[1])+wheight+Math.sin(frame/150)*wosc //0.106
 
 		mat4.translate(waterM, view, [Math.sin(frame/180)*96, height, Math.cos(frame/146)*96])
-		nitroRender.setColMult([1, 1, 1, 0x0A/31]);
+		if (useAlpha) nitroRender.setColMult([1, 1, 1, 0x0A/31]);
 		res.mdl[0].drawPoly(mat4.scale([], waterM, [16, 16, 16]), pMatrix, 0, 0); //water
 
 		gl.stencilFunc(gl.EQUAL, 0, 0xFF);
@@ -49,7 +50,7 @@ window.ObjWater = function(obji, scene) {
 
 		if (obji.ID != 9) {
 			mat4.translate(waterM, view, [0, height, 0])
-			nitroRender.setColMult([1, 1, 1, 0x10/31]);
+			if (useAlpha) nitroRender.setColMult([1, 1, 1, 0x10/31]);
 			res.mdl[0].drawPoly(mat4.scale([], waterM, [16, 16, 16]), pMatrix, 0, 1); //white shore wash part, water is stencil masked out
 		}
 
@@ -57,7 +58,7 @@ window.ObjWater = function(obji, scene) {
 
 		if (res.mdl[1] != null) {
 			mat4.translate(waterM, view, [-Math.sin((frame+30)/180)*96, height, Math.cos((frame+100)/146)*96])
-			nitroRender.setColMult([1, 1, 1, 0x04/31]);
+			if (useAlpha) nitroRender.setColMult([1, 1, 1, 0x04/31]);
 			res.mdl[1].draw(mat4.scale([], waterM, [16, 16, 16]), pMatrix); //water white detail part. stencil should do nothing here, since it's in the same position as the above.
 		}
 
@@ -74,10 +75,13 @@ window.ObjWater = function(obji, scene) {
 			case 0x0001:
 				return {mdl:[{nsbmd:"beach_waterC.nsbmd"}, {nsbmd:"beach_waterA.nsbmd"}]};
 			case 0x0003:
+				useAlpha = false;
 				return {mdl:[{nsbmd:"town_waterC.nsbmd"}, {nsbmd:"town_waterA.nsbmd"}]};
 			case 0x0006:
+				useAlpha = false;
 				return {mdl:[{nsbmd:"yoshi_waterC.nsbmd"}]};
 			case 0x0009:
+				useAlpha = false;
 				return {mdl:[{nsbmd:"hyudoro_waterC.nsbmd"}, {nsbmd:"hyudoro_waterA.nsbmd"}]};
 			case 0x000C:
 				wheight = 38;